A stand 18 is maintained under a stored posture when the stand 18 is pivoted toward the stored posture side in association with a dumping actin of a bucket 13 and a lock mechanism 25 is switched to a locking state. The stand is switched to an in-use posture when the lock mechanism 25 is switched to a releasing state while the stand 18 is maintained under the stored posture by the lock mechanism 25.