To provide a steering shaft support structure which reduces labor for assembly and maintenance.

A support structure of a steering shaft 122 includes: a vehicle body frame 11 in which a head pipe 111 formed into a cylindrical shape is provided; and a steering part including a steering shaft 122 inserted into the head pipe 111, a front fork 123 which is coupled to the steering shaft 122 and rotatably supports a front wheel 121, and a handle which is coupled to the steering shaft 122 and is used for steering operation conducted by a driver. The steering shaft 122 is rotatably supported by an upper bearing provided near an upper end part of the head pipe 111 and a lower bearing provided near a lower end part. One of the upper bearing and the lower bearing supports the steering shaft 122 in a radius direction and the other supports the steering shaft 122 in the radius direction and an axial direction.