A problem to be addressed by the present invention is to provide a technology which measures blood lipid concentration with improved precision. The problem is solved by, when computing a scattering coefficient, assessing whether detected light has been transmitted through blood, and computing the scattering coefficient of the light which is assessed as having been transmitted through the blood. Specifically, provided is a non-invasive biological lipid measuring instrument which measures lipids in blood within a lifeform, said non-invasive biological lipid measuring instrument comprising: an irradiation unit which irradiates light of a prescribed light intensity from outside of a lifeform toward the interior of the lifeform； a light intensity detection unit which, through the scattering within the lifeform of the irradiated light from the irradiation unit, detects the light intensity which is discharged from the lifeform； a scattering coefficient computation unit which computes a scattering coefficient of the light within the lifeform on the basis of the light intensity which is detected by the light intensity detection unit； and a lipid concentration computation unit which computes lipid concentration on the basis of the computed scattering coefficient. The scattering coefficient computation unit assesses whether the light intensity which is detected by the light intensity detection unit has been transmitted through the blood within the lifeform, and computes the scattering coefficient of the light which is assessed as having been transmitted through the blood within the lifeform.Un problème devant être résolu par la présente invention est la fourniture d'une technologie qui mesure la concentration de lipides sanguins avec une précision améliorée. Le problème est résolu par, lors du calcul d'un coefficient de diffusion, détermination qu'une lumière détectée a été transmise ou non à travers le sang, le calcul du coefficient de diffusion de la lumière qui est détermin
