A film forming apparatus includes a susceptor, and a shower head provided above the susceptor and having a first passage and a second passage independent of the first passage formed therein, wherein the first passage is formed through the shower head by being provided with a first cavity surrounded by a first upper wall and a first lower wall, a first thin hole formed in the first upper wall, and a plurality of second thin holes formed in the first lower wall, the height of the first upper wall in the vertical direction is reduced with increase in distance from the first thin hole, and the second passage is formed in the same manner as the first passage.