diff --git a/src/main.ts b/src/main.ts
index a7c8a19..310c574 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -15,4 +15,4 @@ document.querySelector("head > style#innercss")!.innerHTML = css;
 document.querySelector("head > style#collapsible")!.innerHTML = collapsible;
 document.querySelector("head > style#init")!.innerHTML = init;
 // Event listeners...
-document.addEventListener('DOMContentLoaded', handleDOMContentLoaded);
\ No newline at end of file
+document.addEventListener('DOMContentLoaded', handleDOMContentLoaded);
diff --git a/src/script/eventHandlers.ts b/src/script/eventHandlers.ts
index 675db71..5e9faf9 100644
--- a/src/script/eventHandlers.ts
+++ b/src/script/eventHandlers.ts
@@ -7,6 +7,7 @@ import {
     generateShortId, getOrCreateUserShortId, getCurrentPageShortId, encryptSha256, setCookie, getCookie
 } from './utils';
 
+import { TextWikiParseInclude } from "./include";
 
 
 import {
@@ -159,7 +160,42 @@ const handleEditpageInput = debounce((event) => {
     const storageKey = shortid ? `FtmlStorage[${shortid}]` : 'FtmlStorage';
     localStorage.setItem(storageKey, JSON.stringify(FtmlStorageItem));
 
-    ftml.postMessage({ value, type });
+    // const WPInc = {
+    //     source: value,
+    //     vars: {}
+    // };
+    // const parser = new TextWikiParseInclude(WPInc);
+    // parser.parse().then(() => {
+    //     console.log("Source after parsing: \n", WPInc.source);
+    //     ftml.postMessage({ value: WPInc.source, type });
+    // }).catch(error => {
+    //     console.error("Parsing failed with error: ", error);
+    // });
+
+    // [WIP] includeの処理を行う
+    // include元のソースを保持する。(GASの実行制限を考慮して、include元のソースを保持する必要がある)
+    // include元のページを配列で持っておいて、その中身に変更があった場合は、include元のソースを増えたものだけ取得しに行く
+
+
+    const wiki = {
+        source: editpageField.value,
+        vars: {}
+    };
+
+    // console.log("Source before parsing: \n", wiki.source);
+    const parser = new TextWikiParseInclude(wiki);
+
+    // onEditでthis.wiki.sourceを更新する。editpageFieldが更新されたらonEditにeventを渡す。
+    // editpageField.addEventListener('input', parser.onEdit.bind(parser));
+    parser.onEdit(event).then(() => {
+        // console.log("Source after parsing: \n", wiki.source);
+        ftml.postMessage({ value: wiki.source, type });
+    }
+    ).catch(error => {
+        console.error("Parsing failed with error: ", error);
+    });
+
+    // ftml.postMessage({ value, type });
 
 }, 1000);
 
@@ -281,7 +317,7 @@ const handleShareButtonClick = async () => {
     }
 
 
-    
+
 
     console.debug('Sending data to GAS:', dataToSend);
 
diff --git a/src/script/include.ts b/src/script/include.ts
new file mode 100644
index 0000000..2eaada4
--- /dev/null
+++ b/src/script/include.ts
@@ -0,0 +1,161 @@
+import { getDataFromGAS } from "./helper";
+
+interface Wiki {
+    source: string;
+    vars: Record<string, any>;
+}
+
+class Page {
+    constructor(private pageId: string, private source: string) { }
+
+    getPageId(): string {
+        return this.pageId;
+    }
+
+    getSource(): string {
+        return this.source;
+    }
+}
+
+export class TextWikiParseInclude {
+    private conf = { base: '/path/to/scripts/' };
+    private regex = /^\[\[include ([a-zA-Z0-9\s\-:]+?)(\s+.*?)?(?:\]\])$/ims;
+    private includedPages: string[] = [];
+
+    constructor(private wiki: Wiki) {
+        this.updateIncludedPages();
+    }
+
+    async parse(): Promise<void> {
+        let level = 0;
+        let oldSource;
+        do {
+            oldSource = this.wiki.source;
+            const matches = this.regex.exec(this.wiki.source);
+            if (matches) {
+                const output = await this.process(matches.slice(1));
+                this.wiki.source = this.wiki.source.replace(this.regex, output);
+            }
+            level++;
+        } while (oldSource !== this.wiki.source && level <= 10);
+        this.saveIncludedPagesToLocalStorage();
+    }
+
+    private async process(matches: string[]): Promise<string> {
+        const [pageName, subs] = matches;
+        const cleanedPageName = this.toUnixName(pageName.trim());
+
+        // const page = await this.getPageFromDb(cleanedPageName); 
+        const cachedPages = this.getCachedPages();
+        // console.log('cachedPages:', cachedPages);
+        // cachedPagesにpageNameがあれば、pageIdとsourceを取得
+        // なければ、GASから取得
+        const cachedPage = cachedPages[pageName];
+        const page = cachedPage ? new Page(cachedPage.pageId, cachedPage.source) : await this.getPageFromDb(cleanedPageName);
+
+        if (!page) {
+            const output = `\n\n[[div class="error-block"]]\nPage to be included ${cleanedPageName} cannot be found!\n[[/div]]\n\n`;
+            this.wiki.vars.inclusionsNotExist = { ...this.wiki.vars.inclusionsNotExist, [cleanedPageName]: cleanedPageName };
+            return output;
+        }
+
+        let output = page.getSource();
+        if (subs && output) {
+            const subsArray = subs.split('|');
+            for (const sub of subsArray) {
+                const [varName, value] = sub.split('=').map(s => s.trim());
+                if (value && varName && /^[a-z0-9\-_]+$/i.test(varName)) {
+                    output = output.replace(new RegExp(`\{\\$${varName}\}`, 'g'), value);
+                }
+            }
+        }
+
+        this.wiki.vars.inclusions = { ...this.wiki.vars.inclusions, [page.getPageId()]: page.getPageId() };
+        return `${output}`;
+    }
+
+    private toUnixName(name: string): string {
+        return name.replace(/\s+/g, '_');
+    }
+
+    private async getPageFromDb(pageName: string): Promise<Page | null> {
+        try {
+            const data = await getDataFromGAS(pageName);
+            return new Page(data.data.shortId, data.data.source);
+        } catch (error) {
+            console.error('Failed to get page from DB:', error);
+            return null;
+        }
+    }
+
+    private updateIncludedPages() {
+        const regex = /\[\[include ([a-zA-Z0-9\s\-:]+?)(\s+.*?)?\]\]/g;
+        let match;
+        while ((match = regex.exec(this.wiki.source)) !== null) {
+            // this.includedPages.push(match[1].trim()); //重複を削除したい
+            const pageName = match[1].trim();
+            if (!this.includedPages.includes(pageName)) {
+                this.includedPages.push(pageName);
+            }
+        }
+    }
+
+    private saveIncludedPagesToLocalStorage() {
+        localStorage.setItem('includedPages', JSON.stringify(this.includedPages));
+    }
+
+    static loadIncludedPagesFromLocalStorage(): string[] {
+        const savedData = localStorage.getItem('includedPages');
+        if (savedData) {
+            const savedPages = JSON.parse(savedData);
+            if (Array.isArray(savedPages)) {
+                return savedPages;
+            }
+        }
+        return [];
+    }
+
+    async onEdit(event: Event) {
+        const source = (event.target as HTMLTextAreaElement).value;
+        // console.log('Source changed:', source);
+        this.wiki.source = source; // クラス内のwiki.sourceを更新
+        this.updateIncludedPages(); // 引数なしで呼び出し
+        await this.checkForNewIncludes();
+        this.saveIncludedPagesToLocalStorage();
+
+        // paese()を呼び出し、wiki.sourceを更新
+        await this.parse();
+    }
+
+    private async checkForNewIncludes() {
+        const cachedPages = this.getCachedPages();
+        const newIncludes = this.includedPages.filter(page => !cachedPages[page]);
+        if (newIncludes.length > 0) {
+            await this.fetchPagesFromGAS(newIncludes);
+        }
+    }
+
+    private async fetchPagesFromGAS(pages: string[]) {
+        for (const page of pages) {
+            try {
+                const data = await getDataFromGAS(page);
+                this.cachePage(page, data);
+            } catch (error) {
+                console.error('Failed to fetch page:', page, error);
+            }
+        }
+    }
+
+    private cachePage(pageName: string, data: any) {
+        const cachedPages = this.getCachedPages();
+        cachedPages[pageName] = { pageId: data.data.shortId, source: data.data.source }; // オブジェクトをそのまま保存
+        localStorage.setItem('cachedPages', JSON.stringify(cachedPages)); // オブジェクトを文字列に変換して保存
+    }
+
+    private getCachedPages(): Record<string, { pageId: string; source: string }> {
+        const savedData = localStorage.getItem('cachedPages');
+        return savedData ? JSON.parse(savedData) : {};
+    }
+
+}
+