Electronic watch

An electronic watch, comprising:

• a time display unit configured to display a time;
• an antenna configured to receive a radio wave;
• a first substrate at which a first element that is one of a light-emitting element or a light-receiving element is mounted;
• a second substrate at which a second element that is the other of the light-emitting element or the light-receiving element disposed so as to be opposed to the first element is mounted;
• a gear including a through hole through which light emitted from the light-emitting element and received by the light-receiving element passes through, the gear being disposed between the first substrate and the second substrate;
• and
• a first conduction member and a second conduction member configured to electrically couple the first substrate to the second substrate, wherein
• the second substrate includes
• a first wiring line electrically coupled to the first substrate via the first conduction member, and
• a second wiring line electrically coupled to the first substrate via the second conduction member,
• a resistive element is coupled in series halfway in at least one wiring line of the first wiring line and the second wiring line,
• a bypass wiring line for bypassing a resistive element is coupled to a wiring line, among the first wiring line and the second wiring line, that includes the resistive element coupled in series halfway in the wiring line,
• a switch is provided that is configured to select from, as a power supply path from a power source to the first element for supplying power to the first element, a first path via the wiring line in which the resistive element is coupled in series, and a second path via the bypass wiring line, and
• a control unit is included that, while the radio wave is received by the antenna, controls the switch to select the first path, and while the first element is driven, controls the switch to select the second path.