PROBLEM TO BE SOLVED: To provide an agent for giving deep-seeding tolerance that suppresses decline in a budding rate and growth of deep-seeded rice seeds.SOLUTION: The agent for giving deep-seeding tolerance to rice includes as the effective component a 5-aminolevulinic acid represented by general formula (1), RRNCHCOCHCHCOR[wherein Rand Rindicate each independently a hydrogen atom, alkyl group, acyl group, alkoxycarbonyl group, aryl group or aralkyl group Rindicates a hydroxy group, alkoxy group, acyloxy group, alkoxycarbonyloxy group, aryloxy group, aralkyloxy group or amino group], a derivative thereof, or a salt thereof.
