An object of the present invention is to provide a medicament for preventing or treating pulmonary hypertension. The present invention provides a medicament for preventing or treating pulmonary hypertension, comprising a compound selected from the group consisting of (5R)-N-[1-ethyl-1-(4-ethylphenyl)propyl]-2, 7, 7-trimethyl-5-phenyl-4, 5, 6, 7-tetrahydropyrazolo[1, 5-a]pyrimidine-3-carboxamide, (5R)-N-[1-ethyl-1-(4-methoxyphenyl)propyl]-2, 7, 7-trimethyl-5-phenyl-4, 5, 6, 7-tetrahydropyrazolo[1, 5-a]pyrimidine-3-carboxamide, (5R)-N-[1-ethyl-1-(4-ethylphenyl)propyl]-5-(2-fluorophenyl)-2, 7, 7-trimethyl-4, 5, 6, 7-tetrahydropyrazolo[1, 5-a]pyrimidine-3-carboxamide, and the salt thereof.