To provide a vehicular seat device enabling manual adjustment of a seat position if needed and automatic return of a seat to the seat position after manual adjustment.

The vehicular seat device is provided with: a seat motor 20 (seat drive means); a drive force connecting/disconnecting mechanism 21; an M/A selector switch 43 (switching means) for switching connection/disconnection of the drive force connecting/disconnecting mechanism 21; a seat position adjustment lever 11 (manual adjustment means) enabling manual adjustment of the seat 10; a seat position detection sensor 41 (seat position detection means); a memory 34 (storage means) for storing the seat position; a seat position setting switch 42 (seat position setting means) for setting the seat position; and a control means 30 for performing drive control of the seat motor 20 (seat drive means). The seat position detection sensor 41 detects an automatic adjustment position and a manual adjustment position. The control means 30 performs drive control of the seat motor 20 so that the seat 10 is automatically returned to the manual adjustment position when the manual adjustment position is set.