To provide an electronic substrate unit and a game machine which can effectively prevent dishonest acts against an electronic substrate by preventing illegal opening of substrate cases including the electronic substrate.

The electronic substrate unit U1 includes: a first substrate case 35a and a second substrate case 35b which include the electronic substrate in cooperation; a connecting member which connects the first substrate case 35a and the second substrate case 35b; an information member 41 which is fixed to the first substrate case 35a; a breakage part 42b which makes information of an information part substantially unreadable by a reader by contacting the information member 41 when the cases 35a and 35b are shifted from a closed state to an open state.