A portable cellular phone is provided which is capable of surely detecting a
state
of folding of phone bodies by detection of a weak magnetic field produced by a
receiver. A first phone body has a Hall integrated circuit (IC) adapted to detect
a magnetic flux formed by a receiver. When the first phone body and a second phone
body are folded closed, a magnetic flux density of the magnetic flux that is formed
by the receiver and passes through the Hall IC is changed by a magnetic material
placed in the second phone body.
