diff --git a/src/detections/detection.rs b/src/detections/detection.rs
index e0d8e3da..c958f931 100644
--- a/src/detections/detection.rs
+++ b/src/detections/detection.rs
@@ -6,7 +6,7 @@ use crate::detections::rule;
 use crate::detections::rule::RuleNode;
 use crate::yaml::ParseYaml;
 
-use chrono::{DateTime, FixedOffset, ParseError, ParseResult, TimeZone, Utc};
+use chrono::{DateTime, FixedOffset, TimeZone, Utc};
 use evtx::EvtxParser;
 use serde_json::{Error, Value};
 
diff --git a/src/detections/rule.rs b/src/detections/rule.rs
index db1d249e..dfe48b8b 100644
--- a/src/detections/rule.rs
+++ b/src/detections/rule.rs
@@ -268,16 +268,6 @@ impl LeafSelectionNode {
     fn get_matchers(&self) -> Vec<Box<dyn LeafMatcher>> {
         return vec![Box::new(RegexMatcher::new())];
     }
-
-    // LeafMatcherを取得する。
-    fn get_matcher(&self) -> Option<Box<dyn LeafMatcher>> {
-        let matchers = self.get_matchers();
-        let mut match_key_list = self.key_list.clone();
-        match_key_list.remove(0);
-        return matchers
-            .into_iter()
-            .find(|matcher| matcher.is_target_key(&match_key_list));
-    }
 }
 
 impl SelectionNode for LeafSelectionNode {