A biological information measuring device includes a biological information detection unit, a control unit, and a casing. The biological information detection unit includes a first surface-side electrode having electrodes which can come into contact with the user, a second surface-side electrode having electrodes which are exposed on a second surface and come into contact with the user, and an electrocardiographic detection unit. At least one of the first surface-side electrode and the second surface-side electrode has a plurality of electrodes. The control unit sets one electrode of the first surface-side electrode and one electrode of the second surface-side electrode as working electrodes, sets, as a reference electrode, one of the electrodes that are not set as the working electrodes, and causes the electrocardiographic detection unit to measure an electrocardiogram of the user, based on a current detected with the working electrodes.
