Actuator (10) for parking brake comprising: - a housing (12) defining a recess (14); - means (16) operatively interposed between a member (18) drive and a braking member actuation, wherein said members (16) drive are housed at least partially in said recess (12), and comprise a first washer (26), a second washer (28) movable relative to said first washer (26) along a drive shaft (20) after action of said member (18) drive, and a pusher device (30) movable along said drive axle (20) upon relative movement of said two washers being operatively associated said pusher device (30) with said braking member; - a cage (56) adapted to at least partially accommodate the first washer (26), the second washer (28), and a portion of the pusher device (30), and to define a support means (58) return, wherein said cage (56) comprises at least one tab (62) comprising: - a first portion (62a) extending along said driving shaft (20), in the assembled configuration of said actuator being adapted said first portion (62a) to deform elastically when substantially engages the first washer (26); - a second portion (62b) extending in the essentially transverse to said motor (20) characterized axis that said first portion (62a) is elastically deformed upon interaction with a respective portion (64) deforming said first washer, and that in the assembled configuration of said actuator, said second portion (62b) which is adapted to abut along said drive shaft (20) against a respective surface (66) supporting the first washer (26) and the first portion (62a) is received in a seat (70) after the at least partial elastic return of the same tongue in the assembly step on the first washer, said seat (70) in the tangential direction being defined in order prevent relative rotation of the cage and the first washer around the drive shaft (20).
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