Conventional medicinal agent cases hardly release any of a medicinal solution during the period that washing water is being introduced into the case, and after introduction of washing water has stopped, a small amount of the highly-concentrated medicinal solution inside the case is released beneath the case. As such, the medicinal solution cannot be brought in contact with the entire wall surface of a urinal, and the urinal cannot be cleaned efficiently. The disclosed medicinal agent case has an inlet for introducing washing water into the case, in the upper part of a surface (a back surface) opposite to the aforementioned wall surface, and has an outlet in the lower part of the back surface. A medicinal agent is stored inside the medicinal agent case, and during washing, some of the washing water is introduced via the inlet and directed towards the medicinal agent in a storage unit. Said medicinal agent is dissolved, generating a medicinal solution, and the generated medicinal solution is released from the outlet onto the wall surface of the urinal even after washing. The disclosed medicinal agent case has a drain port above the outlet, said drain port having a larger aperture area than the outlet, and while washing water is being introduced, an overflow portion of the generated medicinal solution is released from the drain port.
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