PROBLEM TO BE SOLVED: To provide a biological information measuring device which makes a sensor unit thinner.SOLUTION: The biological information measuring device includes: a sensor unit a cylindrical member inside the sidewall part of which engaging grooves are formed and at the sidewall part of which first notch openings communicating with the engaging grooves is formed and a thin plate which includes a C-shaped one, on the outer periphery of which engaging projections are formed and which is rotated after fitting the engaging projections in the first notch openings to engage the engaging projections with the engaging grooves to grip the sensor unit with the cylindrical member. On the outer periphery at one end side of the C-shaped thin plate, a regulating projection projecting outside the inner peripheral surfaces of the engaging grooves, is formed. When the engaging projections are engaged with the engaging grooves by rotating the thin plate, the regulating projection gets into the engaging groove while the thin plate is elastically deformed in a direction where both ends facing each other approach each other with the C-shaped opening part put therebetween. When the sensor unit is gripped between the thin plate and the cylindrical member, the regulating projection gets in touch with the sidewall part to regulate the rotation of the thin plate in a direction where the regulating projection returns to a second notch opening.COPYRIGHT: (C)2013,JPO&INPIT【課題】センサユニットの取付構造の薄型化を図る。【解決手段】本発明は、センサユニットと、側壁部の内側に嵌合溝が形成されているとともに、嵌合溝と連通する第1切欠口が側壁部に形成されている筒状部材と、C字形状をした薄板であって、外周に嵌合突起が形成されており、第1切欠口に嵌合突起を合わせた後に回転させて嵌合突起を嵌合溝に嵌合させることによって、筒状部材との間でセンサユニットを挟持する薄板と、を備えている。C字形状の一端側の外周に、嵌合溝の内周面よりも外側に突出した規制突起が形成されている。薄板を回転させて嵌合突起を嵌合溝に嵌合させるとき、C字形状の開口部分を挟んで対向する両端が近づく方向に薄板を弾性変形させつつ、規制突起を嵌合溝に潜り込ませると共に、薄板と筒状部材との間でセンサユニットを挟持するとき、規制突起が側壁部と接触することによって、規制突起が第2切欠口に戻る方向への薄板の回転が規制される。【選択図】図6
