A portable device includes: a first housing; a second housing slidably coupled to the first housing, the second housing being slidable from one end of the predetermined slidable range to the other end thereof via the middle position thereof; a first and second spring members; a first and second arms; a connecting arm connecting the first spring member with the second spring member; wherein when the second housing is slid from the one end to the middle position, the first and second spring members generate a reaction force while the second spring member stays in the initial position, and when the second housing is slid from the middle position to the other end, the first and second spring members move along the sliding of the second housing.