Seatbelt device

A seatbelt device includes a tongue (45) including a support member (46) supporting a tongue plate (48) and allowing a webbing (W) to be inserted therethrough, a plunger (53) disposed in the support member (46), a movement member (57) connected to the plunger (53) and moving in a direction in which the webbing (W) is interposed between the movement member and the support member (46) when the plunger (53) is pressed, a fixing member (56) disposed in the movement member (57) and fixing the webbing (W) in accordance with a movement of the webbing (W) in an insertion direction, and a buckle (44) to which the tongue plate (48) is inserted and fixed, wherein the plunger (53) is pressed into the support member in accordance with an operation of inserting the tongue plate (48) into the buckle (44).