Patent ID: 8073173

Claim:
A hearing aid, comprising: a main body case; a battery case that is provided so that it can be pulled from inside the main body case to the outside of the main body case, and houses an air battery; a control device that is actuated by the electromotive force of the air battery held in the battery case; a microphone and a speaker that are electrically connected to the control device; switching part configured to cut off the supply of power from the air battery to the control device in conjunction with the operation of pulling at least part of the battery case out of the main body case, a lid portion that is provided inside the main body case or inside the battery case, and opens and closes an air hole of the air battery in conjunction with the operation of pulling at least part of the battery case out of the main body case, and a protrusion that is provided to the main body case and that biases the air battery to the lid portion side in a storage state in which the lid portion is stowed inside the battery case and part of the battery case has been pulled out of the main body case; wherein the switching part cuts off the power from the air battery to the control device and the lid portion covers the air hole of the air battery in a storage state in which part of the battery case has been pulled out of the main body case.