A housing assembly for a portable electronic device includes a first body, a second body, a first engaging member, a first resilient member and a first housing. The first body has a first space. The second body is installed to the first body and has a first release hole. The first engaging member is movably located in the first space. The first engaging member has at least one first engaging portion. The first resilient member provides a force to the first engaging member to orient the first engaging member toward the first release hole. The first housing is connected to the second body and has at least one first contact portion. When assembling, the first contact portion contacts the first engaging portion. The force of the first resilient member applied to the first engaging member to firmly connect the first housing to the second body.