A portable device includes a first unit including a guide member with a groove; a second unit including a sliding member that slides in the groove of each guide member; and a shield member that shields a boundary portion formed when the second unit is inclined at a predetermined angle with respect to the first unit in an extended state. The groove of the guide member includes a curved section that makes the first unit incline at a predetermined angle with respect to the second unit. One end of the shield member is rotatably supported at an end of the second unit, and the other end is slidably engaged with the groove of the guide member.