diff --git a/src/main/java/org/embulk/input/jira/client/JiraClient.java b/src/main/java/org/embulk/input/jira/client/JiraClient.java
index b192f67..9bc19a5 100644
--- a/src/main/java/org/embulk/input/jira/client/JiraClient.java
+++ b/src/main/java/org/embulk/input/jira/client/JiraClient.java
@@ -30,6 +30,7 @@
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map.Entry;
@@ -222,10 +223,10 @@ private HttpRequestBase createPostRequest(final PluginTask task, final String ur
                                 task.getUsername(),
                                 task.getPassword()).getBytes())));
             request.setHeader(ACCEPT, "application/json");
-            request.setHeader(CONTENT_TYPE, "application/json");
+            request.setHeader(CONTENT_TYPE, "application/json; charset=UTF-8");
             break;
         }
-        request.setEntity(new StringEntity(body));
+        request.setEntity(new StringEntity(body, StandardCharsets.UTF_8));
         return request;
     }
 
diff --git a/src/test/java/org/embulk/input/jira/client/JiraClientTest.java b/src/test/java/org/embulk/input/jira/client/JiraClientTest.java
index 7b91b80..d5182c6 100644
--- a/src/test/java/org/embulk/input/jira/client/JiraClientTest.java
+++ b/src/test/java/org/embulk/input/jira/client/JiraClientTest.java
@@ -182,4 +182,26 @@ public void test_searchIssues_emptyJql() throws IOException
         issues = result.getLeft();
         assertEquals(issues.size(), 2);
     }
+
+    @Test
+    public void test_searchIssues_withJapaneseJql() throws IOException
+    {
+        String dataName = "searchIssuesWithJapaneseJql";
+        JsonObject messageResponse = data.get(dataName).getAsJsonObject();
+
+        int statusCode = messageResponse.get("statusCode").getAsInt();
+        String body = messageResponse.get("body").toString();
+
+        when(statusLine.getStatusCode()).thenReturn(statusCode);
+        when(response.getEntity()).thenReturn(new StringEntity(body, "UTF-8"));
+
+        ConfigSource config = TestHelpers.config().set("jql", "labels=\"テスト\"");
+        task = CONFIG_MAPPER.map(config, PluginTask.class);
+
+        Pair<List<Issue>, String> result = jiraClient.searchIssues(task, null, 50);
+        List<Issue> issues = result.getLeft();
+        assertEquals(1, issues.size());
+        assertEquals("TEST-1", issues.get(0).getValue("key").getAsString());
+        assertEquals("テスト", issues.get(0).getValue("string").getAsString());
+    }
 }
diff --git a/src/test/resources/jira_client.json b/src/test/resources/jira_client.json
index 48ee84e..a2b6c46 100644
--- a/src/test/resources/jira_client.json
+++ b/src/test/resources/jira_client.json
@@ -77,5 +77,28 @@
             ],
             "errors": {}
         }
+    },
+    "searchIssuesWithJapaneseJql": {
+        "statusCode": 200,
+        "body": {
+            "startAt": 0,
+            "maxResults": 50,
+            "total": 1,
+            "issues": [
+                {
+                    "id": "id1",
+                    "key": "TEST-1",
+                    "self": "self1",
+                    "fields": {
+                        "boolean": true,
+                        "long": 1,
+                        "double": 1,
+                        "string": "テスト",
+                        "date": "2019-01-01T00:00:00.000Z",
+                        "json": {}
+                    }
+                }
+            ]
+        }
     }
 }
\ No newline at end of file