The portable device includes: a first casing; a second casing; and a hinge which joins the first and second casings, the first and second casings being capable of turning on the hinge to open and close with respect to each other, wherein when the portable device is in a closed state where the first and second casings close, a first part of the first casing and a first part of the second casing face each other, a second part of the first casing protrudes from behind the second casing, and a second part of the second casing protrudes from behind the first casing, the second parts of the first and second casings being opposite to each other across the first parts of the first and second casings.