Bio-information measurement device

A biological information measuring device wound around a rod-shaped portion to be measured, comprising:

• a band-shaped belt that is wound around the portion to be measured;
• a body that is disposed on a base end part of the belt in a longitudinal direction and is provided with an element for measuring biological information;
• and
• a buckle that connects the base end part and a front end part on an opposite side in the longitudinal direction of the belt so that the belt becomes annular,
• wherein
• the buckle includes
• a first plate frame member that is attached at one end part thereof on an inner surface of the base end part of the belt so as to be rotatable about an axis that intersects the longitudinal direction of the belt, the first plate frame member extending in a plate shape from the one end part to an other end part on an opposite side,
• a second plate frame member that is attached at one end part thereof to the other end part of the first plate frame member so as to be rotatable about an axis parallel with the axis, the second plate frame member extending in a plate shape from the one end part to an other end part on an opposite side, and the other end part of the second plate frame member being attachable to the front end part of the belt, and
• a first plate part having a plate shape and being fixed to the other end part of the second plate frame member so as to be integral with the second plate frame member and a second plate part having a plate shape and attached so as to be rotatable about a rotation axis parallel with the axis and located at a forefront end of the other end part,
• the second plate part has a sticking-out part that extends beyond the first plate part toward the one end part of the second plate frame member when the second plate member overlaps an outer surface of the first plate part,
• a first fixing element is provided on a side of the sticking-out part that becomes an inner surface when the second plate part overlaps the outer surface of the first plate part, and a second fixing element that is engageable with the first fixing element is provided on an outer surface of the front end part of the belt, and
• a first engagement protrusion is provided on a specific part of an end side of the first plate part closer to the one end part of the second plate frame member, and a second engagement protrusion that overlaps the first engagement protrusion in a thickness direction and is engageable with the first engagement protrusion is provided in a part of the second plate part that corresponds to the first engagement protrusion.