In a tape printing device including a battery housing portion, the battery housing portion includes a housing portion main body and a battery lid-which cover an opening portion of the housing portion main body, and the opening portion includes a top surface opening portion facing the bottom surface of the housing portion main body, a front surface opening portion which is formed on one peripheral wall of four peripheral walls of the housing portion main body and continues to the top surface opening portion, and reaches the bottom surface or the vicinity of the bottom surface.