BUCKLE STRUCTURE OF VEHICULAR SEAT

PURPOSE: To provide a buckle structure of a vehicular seat by which shakiness of a buckle at unused time can be prevented without performing special operation and jumping of a seat cushion can be reliably prevented. CONSTITUTION: An upper inserting port 16 having inside a claw part 25 capable of engaging with a tongue 14 passed through webbing 13 and a lower inserting port 17 having inside a claw part 25 capable of engaging with an upward piece 36 arranged on a floor F1 , are arranged on the upper and lower ends of a buckle 18, and the buckle 18 is fixed in a through hole 32 formed in a rear end part of a seat cushion 2 capable of freely standing up and rotating with a front end hinge as the center, and an operation part 28 capable of releasing an engaging condition of the respective claw parts 25 is arranged in a part upward exposed from the through hole 32 of the buckle 18.