A vehicle electronic key comprising a coin cell and a power supply control module (100; 901; 902; 903; 906) configured to be accommodated in a cell holder in a state of being attached to the coin cell in the vehicle electronic key in which the cell holder accommodates the coin cell of which a first pole is an electrode including a central portion of a first surface and of which a second pole is an electrode including a second surface that is on an opposite side of the coin cell from the first surface , a side surface, and a portion of the first surface that is positioned outward of the first pole , the power supply control module (100; 901; 902; 903; 906) comprising: a first sheet portion provided with a first cell side electrode layer connected to the first pole of the coin cell , a terminal side electrode layer connected to a first pole side terminal of the cell holder, and an insulating layer configured to insulate the first cell side electrode layer and the terminal side electrode layer from each other; a second sheet portion provided with a second cell side electrode layer connected to a portion of the second surface of the coin cell ; a wireless communication unit configured to be disposed in a vicinity of the side surface of the coin cell positioned between an edge of the first sheet portion and an edge of the second sheet portion and to perform wireless communication with an external device ; a switch unit configured to switch between a closed state and an opened state, the closed state being a state in which the first cell side electrode layer and the terminal side electrode layer are electrically connected to each other and the opened state being a state in which the first cell side electrode layer and the terminal side electrode layer are electrically disconnected from each other; and a controller configured to cause the switch unit to switch between the closed state and the opened state based on a result of communication performed by the wireless communication unit . a first sheet portion provided with a first cell side electrode layer connected to the first pole of the coin cell , a terminal side electrode layer connected to a first pole side terminal of the cell holder, and an insulating layer configured to insulate the first cell side electrode layer and the terminal side electrode layer from each other; a second sheet portion provided with a second cell side electrode layer connected to a portion of the second surface of the coin cell ; a wireless communication unit configured to be disposed in a vicinity of the side surface of the coin cell positioned between an edge of the first sheet portion and an edge of the second sheet portion and to perform wireless communication with an external device ; a switch unit configured to switch between a closed state and an opened state, the closed state being a state in which the first cell side electrode layer and the terminal side electrode layer are electrically connected to each other and the opened state being a state in which the first cell side electrode layer and the terminal side electrode layer are electrically disconnected from each other; and a controller configured to cause the switch unit to switch between the closed state and the opened state based on a result of communication performed by the wireless communication unit . <EOS>