diff --git a/cmd/user.go b/cmd/user.go
index 55ac4c3..43301c6 100644
--- a/cmd/user.go
+++ b/cmd/user.go
@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"os"
 
+	"github.com/onelogin/onelogin-go-sdk/v4/pkg/onelogin/models"
 	"github.com/pepabo/onecli/onelogin"
 	"github.com/pepabo/onecli/utils"
 	"github.com/spf13/cobra"
@@ -109,10 +110,42 @@ var modifyEmailCmd = &cobra.Command{
 	},
 }
 
+var addCmd = &cobra.Command{
+	Use:   "add <first-name> <last-name> <email>",
+	Short: "Add a new user",
+	Long:  `Add a new user to your OneLogin organization`,
+	Args:  cobra.ExactArgs(3),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		firstName := args[0]
+		lastName := args[1]
+		email := args[2]
+
+		client, err := initClient()
+		if err != nil {
+			return fmt.Errorf("error initializing OneLogin client: %v", err)
+		}
+
+		newUser := models.User{
+			Firstname: firstName,
+			Lastname:  lastName,
+			Email:     email,
+		}
+
+		createdUser, err := client.CreateUser(newUser)
+		if err != nil {
+			return fmt.Errorf("error creating user: %v", err)
+		}
+
+		fmt.Printf("Successfully added user: %s %s with email: %s\n", createdUser.Firstname, createdUser.Lastname, createdUser.Email)
+		return nil
+	},
+}
+
 func init() {
 	userCmd.AddCommand(listCmd)
 	userCmd.AddCommand(modifyCmd)
 	modifyCmd.AddCommand(modifyEmailCmd)
+	userCmd.AddCommand(addCmd)
 
 	listCmd.Flags().StringVarP(&output, "output", "o", "yaml", "Output format (yaml, json)")
 	listCmd.Flags().StringVar(&queryParams.Email, "email", "", "Filter users by email")
diff --git a/onelogin/client.go b/onelogin/client.go
index c432977..d72f142 100644
--- a/onelogin/client.go
+++ b/onelogin/client.go
@@ -14,6 +14,7 @@ const (
 type OneloginClient interface {
 	GetUsers(query models.Queryable) (interface{}, error)
 	UpdateUser(userID int, user models.User) (interface{}, error)
+	CreateUser(user models.User) (interface{}, error)
 }
 
 // Onelogin represents the Onelogin client
diff --git a/onelogin/user.go b/onelogin/user.go
index e5ae638..4bfc003 100644
--- a/onelogin/user.go
+++ b/onelogin/user.go
@@ -1,7 +1,9 @@
 package onelogin
 
 import (
+	"fmt"
 	"strconv"
+	"time"
 
 	"github.com/onelogin/onelogin-go-sdk/v4/pkg/onelogin/models"
 	"github.com/pepabo/onecli/utils"
@@ -55,3 +57,43 @@ func (o *Onelogin) GetUsers(query UserQuery) ([]models.User, error) {
 func (o *Onelogin) UpdateUser(userID int, user models.User) (interface{}, error) {
 	return o.client.UpdateUser(userID, user)
 }
+
+// SetUserState sets the user state to active and updates the last login time
+func (o *Onelogin) SetUserState(userID int) error {
+	user := models.User{
+		Status:    1, // 1はアクティブを示す
+		LastLogin: time.Now(),
+	}
+	_, err := o.UpdateUser(userID, user)
+	if err != nil {
+		return fmt.Errorf("error setting user state: %v", err)
+	}
+	return nil
+}
+
+// CreateUser creates a new user in Onelogin
+func (o *Onelogin) CreateUser(user models.User) (models.User, error) {
+	createdUserInterface, err := o.client.CreateUser(user)
+	if err != nil {
+		return models.User{}, fmt.Errorf("error creating user: %v", err)
+	}
+
+	createdUserMap, ok := createdUserInterface.(map[string]interface{})
+	if !ok {
+		return models.User{}, fmt.Errorf("error asserting created user to map[string]interface{}")
+	}
+
+	createdUser := models.User{
+		ID:        int32(createdUserMap["id"].(float64)),
+		Email:     createdUserMap["email"].(string),
+		Firstname: createdUserMap["firstname"].(string),
+		Lastname:  createdUserMap["lastname"].(string),
+	}
+
+	// ユーザーのステータスをアクティブに設定し、最終ログイン日時を更新
+	if err := o.SetUserState(int(createdUser.ID)); err != nil {
+		return models.User{}, err
+	}
+
+	return createdUser, nil
+}
diff --git a/onelogin/user_test.go b/onelogin/user_test.go
index ebf2d67..6ccb6e3 100644
--- a/onelogin/user_test.go
+++ b/onelogin/user_test.go
@@ -24,6 +24,11 @@ func (m *MockClient) UpdateUser(userID int, user models.User) (interface{}, erro
 	return args.Get(0), args.Error(1)
 }
 
+func (m *MockClient) CreateUser(user models.User) (interface{}, error) {
+	args := m.Called(user)
+	return args.Get(0), args.Error(1)
+}
+
 func TestGetUsers(t *testing.T) {
 	tests := []struct {
 		name          string
@@ -149,3 +154,72 @@ func TestGetUsers(t *testing.T) {
 		})
 	}
 }
+
+func TestCreateUser(t *testing.T) {
+	tests := []struct {
+		name          string
+		inputUser     models.User
+		mockResponse  interface{}
+		mockError     error
+		expectedUser  models.User
+		expectedError error
+	}{
+		{
+			name: "successful user creation",
+			inputUser: models.User{
+				Email:     "newuser@example.com",
+				Username:  "newuser",
+				Firstname: "New",
+				Lastname:  "User",
+			},
+			mockResponse: map[string]interface{}{
+				"id":        3,
+				"email":     "newuser@example.com",
+				"username":  "newuser",
+				"firstname": "New",
+				"lastname":  "User",
+			},
+			expectedUser: models.User{
+				ID:        3,
+				Email:     "newuser@example.com",
+				Username:  "newuser",
+				Firstname: "New",
+				Lastname:  "User",
+			},
+		},
+		{
+			name: "error creating user",
+			inputUser: models.User{
+				Email:     "erroruser@example.com",
+				Username:  "erroruser",
+				Firstname: "Error",
+				Lastname:  "User",
+			},
+			mockError:     assert.AnError,
+			expectedError: assert.AnError,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			mockClient := new(MockClient)
+			o := &Onelogin{
+				client: mockClient,
+			}
+
+			mockClient.On("CreateUser", tt.inputUser).Return(tt.mockResponse, tt.mockError)
+
+			createdUser, err := o.CreateUser(tt.inputUser)
+
+			if tt.expectedError != nil {
+				assert.Error(t, err)
+				assert.Equal(t, tt.expectedError, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, tt.expectedUser, createdUser)
+			}
+
+			mockClient.AssertExpectations(t)
+		})
+	}
+}