To provide a bottle cap, capable of preventing foreign matter from being mixed into a bottle, and capable of easily spouting liquid in the bottle out.

The bottle cap A attached to the opening part 12 of the bottle B provided with a screw in the outer periphery of the same and capable of spouting the liquid from a spout opening has an inner lid 1 attached to the opening part 12 and having the opening 6 communicating with the inside of the opening part, an outer lid 2 located outside of the inner lid 1, rotatably coupled to the inner lid, and having an opening 10 accessible to the inner lid, and an engaging part 7 arranged in the inner lid accessible from the opening 10 of the outer lid 2 and engaged with an operating tool 3 inserted from the opening 10 of the outer lid 2.