Trim cover attachment member of vehicle seat, manufacturing method thereof and vehicle seat

A vehicle seat comprising:

• a trim cover;
• a seat frame having an engaging portion;
• and
• a trim cover attachment member being attached to an end portion of the trim cover, and being engaged with the engaging portion of the seat frame;
• the trim cover attachment member comprising:
• an attachment portion to which the end portion of the trim cover is attached;
• a hook portion having a hook on an upper end thereof, the hook being engaged with the engaging portion, the hook portion being disposed generally in opposite to the attachment portion;
• and
• a bottom portion for connecting a bottom end of the attachment portion and a bottom end of the hook portion;
• wherein a cut-out portion is formed at a portion of the upper end of the hook portion, and an opening portion is formed at a portion of the attachment portion, in a portion of the trim cover attachment member corresponding to a corner portion of the vehicle seat.