The present invention relates to N- {5-[(6,7-dimethoxy-4-quinolinypoxy]-2-pyridinyl 1 -2,5 -dioxo- 1 -phenyl- 1 ,2,5,6,7,8-hexahy dro-3-quinolinecarboxamide ethanesulfonate, which has an Axl-inhibiting activity and is 5 useful as an agent for preventing and/or treating immune diseases, cancer, and the like, a crystal thereof, and a pharmaceutical composition thereof.