本文目的在於探討運動社會化媒介對國小學童運動參與行為的影響。研究以臺中市東平國小扯鈴校隊隊員及相關人員為對象，並以質性個案研究法為探討取徑，輔以深度訪談和文獻資料蒐集，進行分析、佐證與歸納。研究結果如下：一、家人尊重支持學童的喜好，但學業成績卻決定他能否繼續參與扯鈴運動。二、教練的關懷指導吸引學童，但其忽視、不公的態度卻是阻礙。三、同儕之間的感情是關鍵，有無歸屬感是讓學童繼續參與或離去的原因。四、教師會因班級經營、學童行為與家長對成績的要求而決定其支持或反對。五、學校則由校長主導學校方針。運動社會化媒介在國小學童運動參與過程中，直接或間接影響學童們的運動參與行為。

The purpose of this research was to discuss the influence of agents of socialization in sport involvement to elementary school students. Subjects were mainly the team members of diabolo and relevant personnel of Dongping elementary school. This study adopted qualitative case study method in-depth interview and data collection to acquire information. This study adopted qualitative case study method in depth interviewed, and data collection to acquire information, and compared, analyzed, and confirmed them with related literature. The study results include: 1. Family support and parents' respect to the student's preferences. However, the academic achievement will be considered whether he could continue to participate in diabolo team. 2. Coaches' concern and guidance attract students, but their ignorance, injustice is the hindered. 3. The feelings among the peers and the sense of belonging are the key reason for students to continue to participate in or leave the team. 4. The homeroom teachers would support or against students depend on their classroom management, students' behaviors and the requirements of academic achievement from the parents. 5. The school policy is led by the principal. The agents of socialization in sport influence students' sport participating behavior directly or indirectly.