Crystal structure of Nd2Co14B, isotype to Nd2Fe14B /1/ is presented. Nd2Co14B exhibits a spin rotation in the (110) plane at low temperature. The [MATH] axis is of easy magnetization at 300 K. Another reorientation occurs at 543 K toward the (001) plane. This plane is favoured by Co anisotropy, as shown in Y2Co14B study