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: €ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒ€ƒR 2 R 1 NCH 2 COCH 2 CH 2 COR 3 €ƒ€ƒ€ƒ€ƒ€ƒ(1) wherein R 1 and R 2 each independently represents a hydrogen atom, an alkyl group, an acyl group, an alkoxycarbonyl group, an aryl group, or an aralkyl group； R 3 represents a hydroxyl group, an alkoxy group, an acyloxy group, an alkoxycarbonyloxy group, an aryloxy group, an aralkyloxy group, or an amino group.
