A communicating section communicates with a memory element of each of first cartridges via first mount sections. The communicating section has first terminals and second terminals. First signal lines connect the first terminals with the first mount sections. Second signal lines connect the second terminals with the first mount sections. The first mount sections form a plurality of groups. The first mount sections in each group are connected in common with one of the first terminals via a corresponding first signal line. The first mount sections in one group are connected with the second terminals that are different from each other via respective second signal lines. Each of the second terminals is connected with one of the first mount sections in one group and with one of the first mount sections in another group via a corresponding second signal line.