diff --git a/src/fanbox/article/body.rs b/src/fanbox/article/body.rs
index 4306ec9..1894f00 100644
--- a/src/fanbox/article/body.rs
+++ b/src/fanbox/article/body.rs
@@ -1,6 +1,9 @@
+use super::super::check::CheckUnkown;
+use super::super::error::FanboxAPIError;
 use super::block::FanboxArticleBlock;
 use crate::fanbox_api::FanboxClientInternal;
 use json::JsonValue;
+use proc_macros::check_json_keys;
 use std::fmt::Debug;
 use std::sync::Arc;
 
@@ -36,6 +39,21 @@ impl FanboxArticleBody {
     }
 }
 
+impl CheckUnkown for FanboxArticleBody {
+    fn check_unknown(&self) -> Result<(), FanboxAPIError> {
+        check_json_keys!("blocks"+, "imageMap", "fileMap", "embedMap", "urlEmbedMap",);
+        match self.blocks() {
+            Some(blocks) => {
+                for i in blocks {
+                    i.check_unknown()?;
+                }
+            }
+            None => {}
+        }
+        Ok(())
+    }
+}
+
 impl Debug for FanboxArticleBody {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         f.debug_struct("FanboxArticleBody")