A hydraulic excavator is equipped with a bucket, a tilt cylinder, a fourth stroke sensor, and a bucket information computing unit. The bucket is able to rotate about the center of a tilt axis. The tilt cylinder causes the bucket to rotate about the center of the tilt axis. The fourth stroke sensor detects a stroke length of the tilt cylinder. The bucket information computing unit obtains a tilt angle of the bucket on the basis of the stroke length detected by the fourth stroke sensor.