Provided is a body measurement device capable of carrying out a body measurement, such as of abdominal girth or chest girth, with a simple configuration which eliminates moving components. In particular, the body measurement device includes computing device that converts two-dimensional coordinates of images of linear light beams included in images having been captured by a plurality of image capturing devices into two-dimensional coordinates on a certain plane in accordance with a relation stored in a database, and computes a peripheral length of a body of a target person within the certain plane.