Heart beat measuring transmitter and heart beat measuring apparatus

摘要

To prevent a packing of a battery lid from being deteriorated by sweat of a user and maintain waterproof performance of an apparatus over a long period of time. A top side, that is, an upper case of a transmitter case of a heart beat measuring transmitter is provided with a battery containing portion and an openable/closable battery lid for sealing an opening of the battery containing portion in liquid tight, and an openable/closable battery lid cover for covering the battery lid. A waterproof elastic member is provided between an inner face of the battery lid cover and the upper case of the transmitter case to surround an outer side of an outer periphery of the battery lid.