A tablet unit 10 for a vehicle includes a dashboarded-shaped body 36, a handle 42, and a touch pen hold unit 50. The dashboard-shaped body 36 includes a receiving antenna 138 which is interlocked with an operation of the handle and is moved on a tablet opposed surface 52. The receiving antenna 138 inputs electromagnetic waves from a tablet 28 and transmits positional information corresponding to the electromagnetic waves to an antenna on the touch pen 32 holding the touch pen 32 through cables 160a, 160b. A drive game is played by operating the handle, which makes the drive game realistic in comparison with that played by operating the touch pen 32. Tablet units 10 for game devices using a keyboard musical instrument, clock, athletic museum, gun and a register are also provided for malting these games realistic in comparison with that played by operating the touch pen 32.