A slim mouse includes a first housing, a second housing and a connecting member. The first housing includes a first front part and a first rear part, wherein the first rear part has a first slant. The second housing includes a second front part and a second rear part, wherein the second front part has a second slant. The connecting member includes a rotating shaft for connecting the first slant and the second slant, so that the second housing is rotatable with the rotating shaft and relative to the first housing.