To provide a nostril insertion tool for deodorization and inhalation air purification to be put into nostrils simply and easily at a low cost.

A hole is opened at the tip of a spindle-shaped main body, a filter such as a carbon fiber filter or the like is put inside and a lid with a screw type hole is screwed to an entrance. Also, the lid can be partially connected with the main body. Left and right nostrils make a pair and both are connected at a connection part. The filter purifies and deodorizes air entering the body and it is desirable to impregnate it with an aroma and an antibacterial medicine, etc., depending on cases. The whole body is integrally molded and is soft and smooth. Also, since the cost is low, the possibility of being used widely by people is high.