diff --git a/lua/js-i18n/client.lua b/lua/js-i18n/client.lua
index f0f0c2f..e0d63d5 100644
--- a/lua/js-i18n/client.lua
+++ b/lua/js-i18n/client.lua
@@ -2,7 +2,7 @@ local async = require("plenary.async")
 
 local analyzer = require("js-i18n.analyzer")
 local c = require("js-i18n.config")
-local translation_source = require("js-i18n.translation-source")
+local translation_source = require("js-i18n.translation_source")
 local utils = require("js-i18n.utils")
 local virt_text = require("js-i18n.virt_text")
 
@@ -230,7 +230,8 @@ function Client:edit_translation(lang, key)
     local namespace = nil
 
     if c.config.namespace_separator ~= nil then
-      local split_first_key = vim.split(split_key[1], c.config.namespace_separator, { plain = true })
+      local split_first_key =
+        vim.split(split_key[1], c.config.namespace_separator, { plain = true })
       namespace = split_first_key[1]
       split_key[1] = split_first_key[2]
     end
diff --git a/lua/js-i18n/lsp/protocol/notify/text_document_did_change.lua b/lua/js-i18n/lsp/protocol/notify/text_document_did_change.lua
index aaeb551..274fb1c 100644
--- a/lua/js-i18n/lsp/protocol/notify/text_document_did_change.lua
+++ b/lua/js-i18n/lsp/protocol/notify/text_document_did_change.lua
@@ -1,5 +1,6 @@
 local lsp_config = require("js-i18n.lsp.config")
 local reference_table = require("js-i18n.reference_table")
+local translation_source = require("js-i18n.translation_source")
 
 --- ハンドラ
 --- @param params lsp.DidChangeTextDocumentParams
@@ -10,6 +11,13 @@ local function handler(params, client)
 
     local bufnr = vim.uri_to_bufnr(uri)
     local workspace_dir = require("js-i18n.utils").get_workspace_root(bufnr)
+
+    -- 文言ファイル以外の JSON ファイルは無視する
+    local file_name = vim.uri_to_fname(uri)
+    if file_name:match("%.json$") and not translation_source.is_translation_file(file_name) then
+      return
+    end
+
     local ref_table = lsp_config.ref_table_by_workspace[workspace_dir]
     if lsp_config.ref_table_by_workspace[workspace_dir] == nil then
       local ref_table = reference_table.ReferenceTable.new({
diff --git a/lua/js-i18n/lsp/protocol/notify/text_document_did_open.lua b/lua/js-i18n/lsp/protocol/notify/text_document_did_open.lua
index 7e21dfa..11d23ce 100644
--- a/lua/js-i18n/lsp/protocol/notify/text_document_did_open.lua
+++ b/lua/js-i18n/lsp/protocol/notify/text_document_did_open.lua
@@ -1,6 +1,6 @@
 local lsp_config = require("js-i18n.lsp.config")
 local reference_table = require("js-i18n.reference_table")
-local utils = require("js-i18n.utils")
+local translation_source = require("js-i18n.translation_source")
 
 --- ハンドラ
 --- @param params lsp.DidOpenTextDocumentParams
@@ -10,6 +10,13 @@ local function handler(params, client)
 
   local bufnr = vim.uri_to_bufnr(uri)
   local workspace_dir = require("js-i18n.utils").get_workspace_root(bufnr)
+
+  -- 文言ファイル以外の JSON ファイルは無視する
+  local file_name = vim.uri_to_fname(uri)
+  if file_name:match("%.json$") and not translation_source.is_translation_file(file_name) then
+    return
+  end
+
   if lsp_config.ref_table_by_workspace[workspace_dir] == nil then
     local ref_table = reference_table.ReferenceTable.new({
       workspace_dir = workspace_dir,
diff --git a/lua/js-i18n/translation-source.lua b/lua/js-i18n/translation_source.lua
similarity index 87%
rename from lua/js-i18n/translation-source.lua
rename to lua/js-i18n/translation_source.lua
index 8c6c5bd..6a34005 100644
--- a/lua/js-i18n/translation-source.lua
+++ b/lua/js-i18n/translation_source.lua
@@ -7,27 +7,59 @@ local c = require("js-i18n.config")
 
 local M = {}
 
+--- 文言ファイルかを判定するための正規表現を取得する
+--- @return vim.regex[]
+local function get_translation_source_regex()
+  local patterns = c.config.translation_source
+  return vim
+    .iter(patterns)
+    :map(function(pattern)
+      return vim.regex(vim.fn.glob2regpat(pattern))
+    end)
+    :totable()
+end
+
 --- 文言ファイルの一覧を取得する
 --- @param dir string ディレクトリ
 --- @return string[]
 function M.get_translation_files(dir)
   local result = {}
-  -- OPTIMIZE: pattern は on_insert の中で回すほうがいい
-  for _, pattern in ipairs(c.config.translation_source) do
-    local regexp = vim.regex(vim.fn.glob2regpat(pattern))
-    scan.scan_dir(dir, {
-      search_pattern = "%.json$",
-      on_insert = function(path)
+
+  local regexps = get_translation_source_regex()
+
+  scan.scan_dir(dir, {
+    search_pattern = "%.json$",
+    on_insert = function(path)
+      for _, regexp in ipairs(regexps) do
         local match_s = regexp:match_str(path)
         if match_s then
           table.insert(result, path)
+          break
         end
-      end,
-    })
-  end
+      end
+    end,
+  })
   return result
 end
 
+--- ファイルが文言ファイルかを判定する
+--- @param filename string ファイル名
+--- @return boolean
+function M.is_translation_file(filename)
+  if not filename:match("%.json$") then
+    return false
+  end
+
+  for _, regexp in ipairs(get_translation_source_regex()) do
+    local match_s = regexp:match_str(filename)
+    if match_s then
+      return true
+    end
+  end
+
+  return false
+end
+
 --- 文言の更新
 --- @param file string ファイルパス
 --- @param key string[] キー