Patent ID: 7360360

Claim:
A vehicle braking device comprising: a fluid pressure booster that has a control piston operated so that a reaction based on fluid pressure in a booster fluid pressure generation chamber and a brake operation input from a brake operation member are balanced, and that regulates output fluid pressure in a fluid pressure generation source according to axial operation of the control piston to act on the booster fluid pressure generation chamber; and a stroke simulator provided between the brake operation member and the control piston so as to obtain an operation stroke feeling of the brake operation member, a master cylinder being operated according to the fluid pressure in the booster fluid pressure generation chamber, wherein the control piston has a cylindrical shape with part of an inner peripheral surface thereof being a tapered surface with a decreasing diameter toward the front, wherein the stroke simulator includes an input member housed in the control piston slidably in an axial direction backward of the tapered surface and connected to the brake operation member, and an elastic body interposed between the input member and the control piston and housed in the control piston, and wherein the elastic body has a cylindrical shape so as to be elastically deformed according to an action of an axial compressive force along with an advancing operation of the input member, and prevented from being deformed sequentially from the front by restraint with the tapered surface according to an increase in the axial compressive force.