Nasal adaptor and respiratory management device

A nasal adaptor comprising:

• an oral expiration guiding portion which includes an opposing portion that is to be opposed to a mouth of a living body, and in which a mouth-side guide path that guides expiration that is expired from the mouth to the opposing portion is formed;
• and
• an attaching portion being placed above the oral expiration guiding portion with respect to the living body, and to which a measurement member that holds a sensor for measuring the expiration guided by the oral expiration guiding portion, or a tubular measurement member that guides the expiration to an external device is attached,
• wherein the oral expiration guiding portion is integrally connected to the attaching portion, and
• wherein the oral expiration guiding portion includes a positioning changing portion that changes a distance between a connecting portion connected to the attaching portion, and the opposing portion, thereby changing a positioning of the opposing portion.