Vehicle seat

A vehicle seat having a seat back, a first stay and a second stay that are inserted into a first support and a second support of the seat back respectively, and a head rest that is attached to the seat back via the first and second stays, comprising:

• a position adjusting mechanism that adjusts positions of the first and second stays with respect to the first and second supports;
• a retaining mechanism that prevents the first and second stays from slipping out of the first and second supports at positions above positions at which the first and second stays are highest in a range within which the positions of the first and second stays are adjusted by the position adjusting mechanism;
• and
• a first member assembled into the seat back and a second member assembled into the head rest which are connected together inside the first stay,
• wherein a check hole for checking the connection state between the first member and the second member is formed in the first stay in such a position that the check hole is not visible from the outside of the seat when the first and second stays are in the range within which the positions of the first and second stays are adjusted by the position adjusting mechanism, and that the check hole is visible from the outside of the seat when the first and second stays are at the positions at which the first and second stays are prevented from slipping out of the first and second supports by the retaining mechanism.