A simulation apparatus having a steering wheel (6) includes a seat (3) for the operator to be seated thereon, a support base (2) supporting said seat thereon, and a swing frame (19) supported on said support base for angular movement about a vertical axis (18), said seat being supported on said swing frame for angular movement about a horizontal axis transverse to said vertical axis (23). A support frame (27) supports said seat in spaced relation to said vertical axis, said support frame having a curved surface which supports said seat through two movable points (26a,26b) which are symmetrical with respect to a center of said seat. A linkage is operatively coupled to the steering wheel and the swing frame for moving said seat in response to operation of said steering wheel.