diff --git a/proto/portal/v1/benchmark.proto b/proto/portal/v1/benchmark.proto
index ff7da69..1d5c8ce 100644
--- a/proto/portal/v1/benchmark.proto
+++ b/proto/portal/v1/benchmark.proto
@@ -36,6 +36,7 @@ message PostJobFinishedRequest {
   string benchmark_id = 1;
   BenchmarkResult result = 2;
   google.protobuf.Timestamp finished_at = 3;
+  string runner_error = 4; // runner内部のエラーメッセージ
 }
 
 message PostJobFinishedResponse {}