A portable storage device comprises a housing having a first opening, a first
directing
portion and a second opening, and a main body having a storage portion, a connecting
portion corresponding to the first opening, a second directing portion corresponding
to the first directing portion, and a hanging portion corresponding to the second
opening. The main body is slidably located inside the housing and is slidable between
a first position and a second position. When the main body is situated at the first
position, the connecting portion is exposed outside the first opening, and the
hanging portion is hidden in the housing. The storage device is at a status of
being used. When the main body is situated at the second position, the connecting
portion is hidden in the housing, and the hanging portion is exposed outside the
second opening. The storage device is at a status of being housed.