The present invention relates to an earplug for an earphone comprising: a hollow tubular body having an inner surface formed with a plurality of grooves extending along an axis； and a cover surrounding the outer side of the hollow tubular body. Therefore, the creation can utilize the groove design of the earplug to generate an airflow guiding effect, and the sound airflow is transmitted in a uniform direction, reducing the interference and maintaining a high flow rate, so as to improve the sound distortion caused by the conventional earplug, thereby improving the sound quality to provide More delicate sound performance.本創作係關於一種用於耳機之耳塞，其包括：一中空管體，其內表面上形成有沿軸線延伸之複數溝槽；以及一罩體，其環繞於中空管體之外側。藉此，本創作可利用耳塞之溝槽設計，產生氣流導向效果，使聲音氣流朝一致方向傳遞，降低阻擾，保持高流速，以改善習知耳塞導致聲音失真問題，進而提高音質，以提供更細膩的聲音表現。
