Seat reclining device for vehicle

A seat reclining device for a vehicle, comprising:

• a first rotating member;
• a second rotating member that is arranged coaxial with the first rotating member;
• a plate-shaped member to which the second rotating member is fixed;
• a locking member that restricts relative rotation between the first rotating member and the second rotating member;
• a first memory member that is capable of rotating coaxially and integrally with the first rotating member by frictionally engaging with an outer surface of the first rotating member and capable of rotating relative to the first rotating member against frictional engagement force between the first memory member and the first rotating member;
• a second memory member that is capable of engaging with and disengaging from the first memory member;
• and
• an operation mechanism that causes the second memory member to engage with and disengage from the first memory member and selectively locks and unlocks the locking member in conjunction with the engagement and disengagement, wherein
• the first memory member includes
• a sliding surface that, by sliding on the second memory member, restricts engaging action of the second memory member that is accompanied by the locking of the locking member, and
• an engagement slot, into which the second memory member can enter, wherein, when the first memory member is at a predetermined relative rotation position with respect to the second rotating member, the second memory member is inserted into the engagement slot so that engaging action of the second memory member is allowed, thereby restricting relative rotation of the first memory member with respect to the second rotating member,
• the operation mechanism includes
• an elongated guide hole provided in the plate-shaped member, and
• a link member that is coupled to the second memory member inserted in the guide hole, and
• the link member is arranged on the same side of the plate-shaped member as the first memory member in a thickness direction of the plate-shaped member.