In order to provide a biological information measuring device that is capable of reducing a burden on a subject caused by being attached to a finger over a long period, the dimensions of which can easily be changed during production, the biological information measuring device: is provided with a main body, and an attachment part that is integrally attached to the main body and is to be attached to a finger on a body and includes a light source part and a light receiving part that face each other with an area therebetween where the finger is disposed when the attachment part is attached to the finger. The main body comprises an electrical circuit, which contains a signal processing part, a power supply part, and a first terminal that is electrically connected to the electrical circuit. The attachment part comprises the light source part and/or the light receiving part, and a second terminal that is electrically connected to the light source part and/or the light receiving part. The first terminal and the second terminal are mechanically connected and electrically connected. The signal processing part acquires a digital value related to a pulse wave on the basis of a signal outputted from the light receiving part due to the light receiving part receiving light that has been emitted from the light source and transmitted through the finger.Selon la présente invention, afin de produire un dispositif de mesure dinformations biologiques qui est capable de réduire la charge pour un sujet causée par le fait quil doit être fixé à un doigt pendant une longue durée, dont les dimensions peuvent aisément être modifiées pendant la production, le dispositif de mesure dinformations biologiques : est pourvu dun corps principal, et dune partie de fixation qui est intégralement fixée au corps principal et doit être fixée à un doigt sur un corps et comprend une partie de source de lumière et une partie de réception de lumière qui se font mutuellement face avec un espace entre celles-ci
