Abstract
A conveyor device includes: a first rotating body; a second rotating body; an endless belt entrained between the first rotating body and the second rotating body; and a plurality of engaging portions provided on a surface of the endless belt and engageable with the first plates. The conveyor device further includes: a first portion including the first rotating body and located mainly in water of the water tank; and a second portion including the second rotating body and located mainly above the water of the water tank. In the first portion, the endless belt is configured to move upward at a first angle with respect to a water surface of the water tank. In the second portion, the endless belt is configured to move upward at a second angle larger than the first angle with respect to the water surface of the water tank.