A door latch device (10) includes a motor (94), a mechanical mechanism (38), a door lock ECU (2), and a case (20). The door lock ECU (2) includes a printed wiring board (120) and a capacitor (202) connected to the printed wiring board (120). The case (20) includes a bottom plate (122b), a first accommodation space (36) for accommodating the motor (94) and the mechanical mechanism (38) on one side of the bottom plate (122b), and a second accommodation space (124) for accommodating the printed wiring board (120) and the capacitor (202) on the other side of the bottom plate (122b). The bottom plate (122b) is provided with a capacitor accommodation portion (125) recessed from the second accommodation space (124) toward the first accommodation space (36) and the capacitor (202) is arranged in the capacitor accommodation portion (125).