Disclosed is a braking device in which all multiple ports (for example, input ports (15c, 15d) and output ports (15a, 15b)) provided on a front surface portion (30) of a base (10) of a master cylinder (1), connector connection ports (23a, 24a) of connectors (23, 24) that electrically conducts an electrical part accommodated in a housing (20), and a pipe connection port (3c) to which a hose is connected of a reservoir (3) are arranged toward front of a vehicle when a starting device (A1) is assembled in the vehicle.