A rotation transmission mechanism of a spinning reel for fishing transmits a rotation of a handle to a driven gear of a reciprocating mechanism. The rotation transmission mechanism includes an intermediate gear, a shaft member, and a biasing member. The intermediate gear rotates in response to rotation of the handle, meshes with the driven gear, and transmits the rotation of the handle to the driven gear. The shaft member rotatably supports the intermediate gear. The biasing member biases the intermediate gear in an axial direction of the shaft member.