Pivoting unit including pivotable body

Provided is a pivoting unit including a pivotable body (25), a horizontal pivot shaft (32), a support (26) for supporting the pivotable body (25) pivotably about the pivot shaft (32) so as to allow the pivotable body (25) to take a fallen posture and a raised posture in which the pivotable body is more raised than the fallen posture, and a stop member (37) for stopping the pivotable body (25) in the raised posture. The stop member (37) includes a long hole (38) vertically extending and allowing the pivot shaft (32) to be inserted therethrough, being disposed vertically movably between upper and lower positions. The stop member (37), in the lower position, abuts against an abutment portion (36), a specific part at a lower end of the pivotable body (25) in the raised posture, to retain the pivotable body (25) in the raised posture, while, in the upper position, allowing the pivotable body (25) to pivot from the raised posture toward the fallen posture.