Abstract: A tilt structure allows the tilt of a console to be changed through simple motion and has a simple configuration. The tilt structure includes: a second frame attached to an upper portion of a first frame and is swingable upward and downward; and a control member attached to the second frame and is tiltable backward and forward through a tilting shaft. The control member includes a guide part with a groove housing a first frame pin. A locked and unlocked state switch to each other by causing the control member to tilt. The locked state includes a pin engaged with any of the engagement parts. The unlocked state includes the pin disengaged. The tilt of the second frame relative to the first frame is changed by engaging the pin with an arbitrary engagement part of any of the engagement parts and changing a distance between the tilting shaft and pin.

Abstract: A driver seat for an operator includes: a fastener configured to fasten a pair of hip belts; a pair of shoulder belts each having a distal end attached to each of the pair of hip belts, the pair of shoulder belts being configured to hold a shoulder area of the operator; and a fastened-state detector configured to detect whether or not the fastener is fastened. The fastened-state detector includes: a detector main body configured to detect whether or not the fastener is fastened through electrical continuity; a signal line connected to the detector main body; and a bag-shaped section integrated with one of the pair of shoulder belts in a drawing direction of the shoulder belt, the bag-shaped section housing the signal line.