An electronic portable device includes two housings 10 and 20 and a connecting mechanism which connects housings 10 and 20 so as to allow housings 10 and 20 to be shifted from one state to another state by a rotating operation, wherein the connecting mechanism has first guide groove 31 and second guide groove 32 formed in housing 10, third guide groove 33 and fourth guide groove 34 formed in housing 20, first shaft pin 41 penetrating guide grooves 31 and 33, and second shaft pin 42 penetrating guide grooves 32 and 34, wherein the guide grooves 31 to 34 form a circular arc, the guide grooves 31 and 32 are line-symmetric with respect to the center line of first housing 10 in the closed state; the guide grooves 33 and 34 are line-symmetric with respect to the center line of first housing 10 in the first open state.