PROBLEM TO BE SOLVED: To cause a subject animal to learn using a task of various kinds and modes of patterns in a state that the subject animal can move freely without being constrained.SOLUTION: An operation supply part 31 includes an operation part 311 in which an operation is performed by a subject animal to which a predetermined stimulus is applied, and a reward supply port 312 to supply a reward to the subject animal when the operation is correct. The reward supply port 312 is formed as part of the operation part 311. The operation supply part 31 is supported by a support part 33 so as to be rotatable in each of a first virtual plane and a second virtual plane orthogonal to each other in a space.