The present invention relates to polyvalent metal salts of a phosphoric diester represented by formula (1) and organo(poly)siloxanes modified with a polyvalent metal salt of a phosphoric diester having the structural units represented by formulae (9) and (10). In formula (1), R1 represents a C1 to C20 linear or branched alkyl group, R?2 and R4¿ are the same or different and independently represent a C2 to C3 linear or branched alkylene group, R3 represents a C3 to C20 linear or C5 to C20 branched alkylene group, A represents a group -COO- or -O-, x and y are the same or different from each other and independently represent an integrer of 0 to 10, L represents a C1 to C40 linear or branched alkyl group or a group, R1-(OR2)x-A-R3-(OR4)y- wherein R?1, R2, R3, R4¿, A, x and y have the same meaning as defined herein before, M represents a divalent or polyvalent metal atom, and m represents the same value as the valence of M. In formulae (9) and (10), R5: a C2 to C20 alkylene group, R6: a C1 to C50 linear or branched alkylene group which may optionally be substituted by a hydroxyl group, p: a number from 0 to 200, M: a divalent or polyvalent metal atom, n: a number same as the value of the valence of M. R?7, R8, R9, R10¿ independently represent hydrogen, alkyl, alkoxy, phenyl or a structural unit represented by formula (10), w: a number of 0 or 1. The compounds according to the present invention impart thixotropic rheology to oil bases and silicone oils which are used in various fields. They are very safe compounds and constitute transparent and excellent gels which provide favorable sensation during use, and thus they are especially useful as materials for preparing cosmetic compositions and perfume compositions.