Film forming apparatus and gas-liquid separating apparatus

A film forming apparatus comprising:

• a reaction chamber;
• a first pipe having first end portion and second end portion, the first end portion being connected to the reaction chamber, the first pipe extending in a first direction in the vicinity of the second end portion, and having a first opening area in cross-section perpendicular to the first direction;
• a second pipe disposed such that the first pipe is provided between the reaction chamber and the second pipe, the second pipe having third end portion and fourth end portion, the third end portion being on an end closer to the first pipe than the fourth end portion, and the second pipe extending in a second direction different from the first direction in the vicinity of the third end portion;
• a narrow portion provided in the first pipe and having a second opening area smaller than the first opening area in cross-section perpendicular to the first direction;
• and
• a liquid storage portion located on an imaginary straight line extending from a center of the second end portion in the first direction.