A buckle device including: a buckle that is configured to engage with a tongue of a seatbelt device, a cover member that includes a first member and a second member for assembly together, and at which the buckle is provided; an elongated member that is anchored to the first member at a length direction leading end portion of the elongated member, and a retention section that is provided at the first member, and that is configured to engage a portion of the elongated member that is further toward a length direction base end side of the elongated member than the length direction leading end portion.