A biological information measuring device includes a case section having, in sectional view, a trapezoidal shape including an upper base and a lower base shorter than the upper base, a first leg substantially orthogonal to the upper base and the lower base, and a second leg that is the opposite side of the first leg, a display section disposed on the second leg side, a main circuit board housed in the case section, a flexible board configured to electrically connect the main circuit board and the display section, and a pulse-wave sensor section disposed on the first leg side and configured to detect a pulse wave signal of a user. The flexible board is disposed on the lower base side.
