Holding structure, battery module, and machine body

A holding structure for detachably holding a battery module on a machine body, the holding structure comprising:

• at least one shaft provided on a lower portion of the battery module;
• and
• at least one receiving recess provided in the machine body and opening in a tilt direction which is tilted outward of the machine body toward an upper side,
• wherein each of the at least one shaft is rotatably received in a corresponding one of the at least one receiving recess such that the battery module is displaceable between a use position and a removal position where, compared to the use position, the battery module is tilted in a direction in which an upper portion thereof is separated away from the machine body and where the battery module can be removed along the tilt direction,
• the battery module includes at least one engagement part provided above the at least one shaft, and
• the machine body is provided with at least one support part that supports a side surface of the at least one engagement part on a side opposite from the machine body when the battery module is in the removal position.