To improve operability and to easily wash away milk dregs.

An adapter 4 or a cap 300 is formed to a dog leg shape and therefore a user can have milk drunk by an infant embraced by her in the posture as it is even if a bottle body 1 is not so much inclined in lactating. Consequently, the lactating person is no more forced to hold the nursing bottle in the undue posture and the handling during lactation is made easier. Further, if the adapter 4 or the cap 300 is bent to the dog leg shape as described above, the need for providing the bottle body with a bent part or bellows part is eliminated and the milk dregs may be easily washed away during the cleaning of the bottle body 1 and the possibility of sticking of the milk dregs, or the like, to the bottle body 11 eliminated.