A tripropeptin derivative represented by any one of the following general formula (1) and the following general formula (2) or a pharmacologically acceptable salt thereof. However, in said general formula (1), R1 represents a C1-C20 organic group. However, in said general formula (2), R2 represents a C1-C20 organic group.下記一般式(1)及び下記一般式(2)のいずれかで表されるトリプロペプチン誘導体又はその薬理学上許容される塩である。ただし、前記一般式(1)中、R1は、炭素数1~20の有機基を表す。ただし、前記一般式(2)中、R2は、炭素数1~20の有機基を表す。