of the spring 11 and the pin 19 turns until the pin 19 gets in contact with the upper end portion of the long hole 20 then as shown in fig2 the pin 18 a of the first link member 17 comes within a locus of turn of the contact portion 5 a of the rotary member 5 in fig3 the seat device in a walk in operation condition is indicated when the seatback is turned in forward direction for the walk in operation the upper arm 3 turns in counterclockwise direction the contact portion 5 a of the rotary member 5 gets in contact with the pin 18 a the pin 18 a is moved in the same direction with the contact portion 5 a and the pin 18 a also gets in contact with the stopper portion 10 of the base bracket 6 accordingly the movement of the upper arm 3 is stopped by the stopper portion 10 and maintained in the walk in position as shown in fig3 the first link member 17 with the pin 18 a as an intervening member to transfer the movement of the upper arm 3 to the cable 13 is turned in clockwise direction around the pin 16 then the second link member 18 is turned in the same direction with the first link member 17 by the pin 19 consequently the cable 13 is pulled and the lock mechanism not shown is released as a result the front seat position can be moved in.