Glass formation ability and magnetic properties of Fe（Co）-Nd-M-B glassy alloys were investigated. The substitution of 2% elements TM（=Nb, Ta, Mo and W） for Fe and Co increases crystallization temperature Tx and decreases the onset temperature of solidification Tm, leading to a significant increase in the thermal stability against crystallization for Fe（Co）-Nd-B glassy alloys. Also the thermal stability against crystallization of Fe（Co）-Nd-B glassy alloys is not improved by substitution of 2% elements TM（=Cr, V, Hf and Zr） for Fe and Co. The bulk glassy alloy with a diameter up to 1 mm is produced by copper mold casting. The saturation magnetization and coercive force of glassy Fe（Co）-Nd-M-B alloys are 1.13 to 1.19 T and 3.85～4.98 A·m-1, respectively.
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