This design improves the play structure by spring tension and provides more stable and improved use safety, as well as adjust tension force of spring appropriately according to body characteristics according to different age and weight. So that the user can enjoy the play safely. The present invention relates to a tennis racket for a tennis racket having a tennis racket having a tennis racket and a tennis racket, The tension supporter (2, 2 ') comprises: The upper and lower casings 4 and 4 'constitute the upper and lower casings 4 and 4' which are inserted into the other casings 4 and 4 ' The spring 3 can be compressed and elongated by the expansion and contraction of the upper and lower casings 4 and 4 'and the spring 3 can be adjusted as an adjusting tool 5 to adjust the tension force .
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