To provide a hop alpha acid or hop oil content enhancer, which increases the content of a hop alpha acid or a hop oil.A hop alpha acid or hop oil content enhancer, which comprises 5-aminolevulinic acid, or a derivative thereof represented by the following formula (1), or a salt thereof as an active ingredient: R2R1NCH2COCH2CH2COR3  (1) wherein R1 and R2 each independently represents a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group, or an aralkyl group; R3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group, or an amino group.