Let Mn be an n-dimensional Riemannian manifold which is minimally immersed in a unit sphere Sn+P(l) of dimension n+p. Then the second fundamental form h of the immersion is given by h{X, Y)=1XY―1 xY and it satisfies h{X, Y)―h(Y, X), where 7 and 7 denote the covariant differentiationon Sn+P(l) and Mn respectively, X and Y are vector fields on Mn. We choose a local field of orthonormal frames eu ・・・,en, ■■■, en+p in Sn+P(l) such that, restricted to Mn, the vector eu ・■・,en are tangent to Mn. We use the following convention on the range of indices unless otherwise stated: A, B, C, ・・・=!, 2, ・・・, n+p; i, j, k, ■・・=!,2, ・・・, n; a, j8,■■・ = n+l, ・■・,n+p. And we agree that repeated indices under a summation sign without indication are summed over the respective range. With respect to the frame fieldof Sn+P(l) chosen above, let <5i,・■・,aJn+p be the dual frames. Then structure equations of Sn+P(l) are given by