A handheld electronic device including a main body, a first magnetic member and a stylus is provided. The main body has a containing slot and the first magnetic member is disposed at one side of the containing slot. The stylus is suitable for being inserted in the containing slot and includes a stylus body and a second magnetic member. The second magnetic member is disposed on the stylus body or embedded in the stylus body. When the stylus is contained within the containing slot, the stylus is kept within the containing slot due to magnetic force generated by the first magnetic member and the second magnetic member.