PROBLEM TO BE SOLVED: To provide an electric brake device capable of preventing lubricant from adhering to a boot in assembling the electric brake device, and excellent in reliability for operation of a piston member.;SOLUTION: An electric brake device has: a support ring 54 fixed so as to face an annular mating surface 30 in an axis direction wherein the mating surface surrounds an opening of a storage hole 13 of a housing part 5B; and an expandable boot 50 of which one end is connected to an inner periphery of the support ring 54, and the other end is connected to an outer periphery of a projection portion of a piston member 15 projecting from the storage hole 13, wherein on the mating surface 30 of the housing part 5B, an annular groove 39 sectioning the mating surface 30 into an inner diameter portion and an outer diameter portion is formed; and a gap between the outer diameter portion of the mating surface 30 with respect to the annular groove 39 and a mating surface 29 is sealed by liquid gasket 45.;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2019,JPO&INPIT
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