Laser light from of semiconductor laser 12 diverging, it forms seat light Ls with cylindrical lens, 22 makes cross mutually at specified position. Scattered light with of the linear lighting region Lx which seat light Ls crosses it possesses the lens system 30 which image formation it can point in rectilinear condition. Optical fiber array 32 of plural optical fibers 34 is prepared for image formation position of lens system 30. The Doppler frequency by the blood style the scattered light which is shifted, it has the avalanche photodiode 42 which in every optical fiber 34 is converted to the electric information. As laser light Doppler frequency from the scattered light which is shifted, in every each optical fiber 34 calculates the blood flux which is while organism organizing with of linear lighting region Lx, scanning, it calculates the blood flux of the blood vessel in the specified territory of in vivo, the range where measurement precision is high, is wide laser Doppler blood style measuring method and the device whose efficiently multidimensional measurement is possible.
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