An electronic apparatus includes: a first casing; a second casing; a coupling mechanism for coupling the first and second casings while allowing the first and second casings to slide and rotate with each other in a state where the first and second casings being overlapped with each other, the coupling mechanism retaining the first and second casings to be in one of: a first posture in which the first and second casings are being overlapped; a second posture in which the first and second casings are being slidably moved; and a third posture in which the first and second casing are being rotated; a magnet provided in one of the first casing and the second casing; a first magnetic sensor and a second magnetic sensor which are provided in the other of the first casing and the second casing, the sensors outputting detection signals generated by a magnetic force of the magnet.