A portable electronic device includes a housing and a main body. The housing has an image pickup window. The main body is accommodated in the housing. The main body includes a first lens module, a second lens module, a rotatable base and a driving element. The rotatable base carries the first lens module and the second lens module thereon. The driving element is configured for driving the rotatable base to rotate to selectively allow the first lens module or the second lens module to be aligned with the image pickup window.