³¹P MAS-NMR spectra were measured for pulverized binary and ternary glasses containing Ca²⁺ ions after soaking in a simulated body fluid (Kokubo solution; pH=7.25) for 1d, and the chemical state of adsorbed phosphate ions were examined. The ³¹P chemical shift indicated that orthophosphate ions, H_xPO₄^-(3-x) (0<x<3), were adsorbed on all the glasses but 60CaO⋅40Al₂O₃; pyrophosphate ions, H_zP₂O₇^-(4-z) (0<z<4), were detected on the aluminate glass, indicating that orthophosphate ions in the Kokubo solution were dimerized on the glass surface. For the glasses such as 60CaO⋅40Al₂O₃, 40CaO⋅60B₂O₃, 40CaO⋅30B₂O₃⋅30Al₂O₃ and 40CaO⋅30B₂O₃⋅30SiO₂, those phosphate ions gave broad ³¹P MAS-NMR speetra, hence have a broad distribution by coordinating to the various surface sites of the glasses. On the other hand, sharp ³¹P MAS-NMR spectra as for a cortical bone (rabbit) were obtained for the rest of the glasses, 50CaO⋅50SiO₂ and 40CaO⋅30B₂O₃⋅30TiO₂, on which apatite formed in shorter soaking period in the Kokubo solution. It was thus concluded that presence of orthophosphate ions on the glass surfaces favored the deposition of apatite.