This lipid membrane structure has the formula (I): (R1) (R2) C (OH)-(CH2) a- (O-CO) bX as a lipid component (wherein a represents an integer of 3 to 5). B represents an integer of 0 or 1, R1 and R2 each independently represent a linear hydrocarbon group which may have -CO-O-, and X represents a 5- to 7-membered non-aromatic heterocycle. A group or the following formula (B) (in the formula, d represents an integer of 0 to 3, R3 and R4 each independently represent a C1-4 alkyl group or a C2-4 alkenyl group. R3 and R4 are bonded to each other. May form a 5- to 7-membered non-aromatic heterocycle (which may be substituted with 1 or 2 C1-4 alkyl groups or C2-4 alkenyl groups on the ring). Which is a group represented by the formula [1]. [Chemical 1]この脂質膜構造体は、脂質成分として式(I)：(R1)(R2)C(OH)-(CH2)a-(O-CO)b-X〔式中、aは3～5の整数を示し；bは0又は1の整数を示し；R1及びR2はそれぞれ独立に-CO-O-を有していてもよい直鎖状炭化水素基を示し；Xは5～７員非芳香族ヘテロ環基又は下記の式(B)(式中、dは0～3の整数を示し、R3及びR4はそれぞれ独立にC1-4アルキル基又はC2-4アルケニル基を示す。R3及びR4は互いに結合して5～7員非芳香族ヘテロ環(当該環上には1又は2個のC1-4アルキル基又はC2-4アルケニル基が置換していていてもよい)を形成してもよい)で表される基を示す〕の脂質化合物を含む脂質膜構造体である。［化１］
