Patent ID: 6895643

Claim:
A buckle device comprising: a device main body into which is inserted a tongue plate provided at a webbing belt; a locking mechanism having a latch which is provided within the device main body so as to be movable between an engagement position, at which the latch engages with the tongue plate which has been inserted in the device main body, and an engagement released position, at which the latch does not engage with the tongue plate, wherein when the latch moves to the engagement position, the latch engages with the tongue plate and restricts pulling-out of the tongue plate from the device main body; a first detecting mechanism detecting the tongue plate which has been inserted in the device main body, and outputting a first detection signal in a state in which the first detecting mechanism detects at least the tongue plate; a second detecting mechanism selected from one of directly or indirectly detecting the latch which is positioned at either one of the engagement position and the engagement released position, and outputting a second detection signal in a state in which the second detecting mechanism detects at least the latch; and a judging mechanism connected to the first detecting mechanism, and, on the basis of the first detection signal from the first detecting mechanism, judging whether or not the tongue plate has been inserted in the device main body, and connected to the second detecting mechanism, and, on the basis of the second detection signal from the second detecting mechanism, judging whether the latch is positioned at the engagement position or the engagement released position.