PROBLEM TO BE SOLVED: To efficiently perform device mounting work to a subject when acquiring a plurality of pieces of biological information, and to suppress trouble felt by the subject.SOLUTION: An airway case 20 includes a gas passage 21, and can be mounted with a first light emitting element 51 and a first light receiving element for detecting a carbon dioxide concentration contained in the expiration of a subject 2 flowing into the gas passage 21. A nasal cannula 30 has a pair of insertion parts 31, 32 inserted into the nostrils 4 of the subject 2 to lead the expiration from the nostrils 4 to the gas passage 21. A mouth guide 40 is disposed in front of the mouth 5 of the subject 2 to lead expiration from the mouth 5 to the gas passage 21. A second light emitting element 61 is supported by one insertion part 31 of the pair of insertion parts, and a second light receiving element 62 is supported by the other insertion part 32. The pair of insertion parts 31, 32 is inserted into the nostrils 4 of the subject 2, so that the second light emitting element 61 and the second light receiving element 62 are disposed oppositely to each other with the nasal septum 4a of the subject 2 sandwiched.【課題】複数の生体情報を取得する場合において、被検者への機器装着作業を効率的に行なうことができ、かつ被検者が感じる煩わしさを抑制する。【解決手段】エアウェイケース２０は通気路２１を備え、通気路２１に流入する被検者２の呼気に含まれる二酸化炭素濃度を検出するための第１発光素子５１と第１受光素子が装着可能とされている。ネーザルカニューラ３０は、被検者２の鼻孔４に挿入されて、鼻孔４からの呼気を通気路２１に導く一対の挿入部３１、３２を有する。マウスガイド４０は、被検者２の口５の前方に配置されて、口５からの呼気を通気路２１に導く。一対の挿入部の一方３１に第２発光素子６１が支持され、他方３２に第２受光素子６２が支持される。一対の挿入部３１、３２が被検者２の鼻孔４に挿入されることにより、第２発光素子６１と第２受光素子６２が被検者２の鼻中隔４ａを挟んで対向配置される。【選択図】図２
