PURPOSE: To obtain a racket frame with a little vibration and impact even when a ball hitting is executed in dislocation from an impact center by causing the back width of a frame part to support a longest longitudinal gut and a longest lateral gut to be small, composing a part whose back width is made large between them, and gradually increasing and decreasing the space between the frame parts of the back widths.

CONSTITUTION: A top 5 and a yoke 7 are made into the minimum back widths as the frame parts to support a longitudinal gut 8, and the top 5 and yoke 7 are formed with an HP(hyperbolic parabolic) curved surface and an EP(elliptic parabolic) curved surface, respectively. The back width dimension is formed to be maximum in respective line parts of frame parts B, B, D and D at four points in the approximately intermediate respective parts of the top 5 and sides 6 and 6 and the yoke 7 and sides 6 and 6. The space between the minimum part and maximum part of the frame back width is formed in the curved surface to be smooth in which the back width is gradually increased and decreased, and even the section of a shaft part 3 from a yoke part 2 up to a grip 4 edge is made to gently correspond the thickness of the grip part 4.