Salts or their solvates of cinnamide compound

The present invention, in the powder X-ray diffraction, and wherein such by having a diffraction peak at a diffraction angle (2θ ± 0.2 °) 10.9 °, having an Aβ production inhibitory action, the following formula In two different salts suitable crystalline drug development, including the hydrochloride salt monohydrate of the compound represented by crystalline form, amorphous body is provided.