PROBLEM TO BE SOLVED: To provide a plant growth accelerator capable of immediately exerting a growth accelerating effect stably irrespective of the environment of the soil upon application, and capable of being stored stably for a long period of time upon storage.SOLUTION: A plant growth accelerator is obtained by depositing vegetable oil or fat 11 to a porous material 12, and the plant growth accelerator is characterized in being obtained by mixing the porous material 12 to which the vegetable oil or fat 11 is deposited, and a porous material 22 to which a lipid degrading aerobic bacterium 21 is deposited. As the lipid degrading aerobic bacterium 21, bacterium of the genus Bacillus is preferably used.COPYRIGHT: (C)2014,JPO&INPIT【課題】施用した際には土壌の環境に左右されず、安定して生長促進効果を即座に発揮し、保管に際しては長期に亘って安定的に保管可能な植物生育促進剤を提供する。【解決手段】植物油脂11を多孔質物質12に付着させてなる植物生長促進剤において、該植物生長促進剤は、植物油脂11を付着させた多孔質物質12と、脂質分解好気性菌21を付着させた多孔質物質22と、を混合してなることを特徴とする植物生長促進剤。脂質分解好気性菌21としてはバチルス属菌を用いることが好ましい。【選択図】図1