To provide a spinning reel for fishing use ensuring a spool braking to be conducted on the rear portion of a reel box and designed to stabilize and smooth the drag operation of a spool shaft through mitigating kinks at the engagement point between the spool shaft and the slider of an oscillation mechanism.

This spinning reel for fishing use has such a scheme that an engagement element 20 engaged turnably on the circumferential groove 18 of a spool shaft 7 is detachably mounted on a slider 15 fitted turnably into the spool shaft 7, and both the engagement element 20 and the engagement pin 17 for the slider 15 engaged on the traverse cam shaft 16 of an oscillation mechanism are supported upon a seizing plate 21 stuck to the slider 15 so as not to fall off.