To provide a rack shaft support device which can be made compact in a pressing direction, and a steering device including the same.

A rack shaft support device 40 includes: a support yoke 50, a plug 60, an intermediate cam component 70, and a rotation force generating spring 80. The plug 60 includes a plug body 61, a plug cap component 67, and a locknut 68. The intermediate cam component 70 includes an intermediate cam body 71, an intermediate cam portion 72, a second restricting portion 200, and a cam projecting portion 300. The cam projecting portion 300 includes a projecting portion body 310 and a tool corresponding portion 320. The tool corresponding portion 320 has a hexagonal hole 322 corresponding to a hexagonal wrench key.