An analyzer comprising: a light irradiation device including a light source and a rotatable filter section having a plurality of optical filters (14b-14f) with different light transmission characteristics respectively for irradiating an analyzing object with lights transmitted through said optical filters (14b-14f) during rotation of said filter section while successively switching said optical filters (14b-14f) arranged on a path of a light from said light source by rotating said filter section at a constant speed; and analytic means for analyzing characteristics of said analyzing object on the basis of optical information obtained from said analyzing object irradiated with the lights by said light irradiation device during the rotation of said filter section, the analyzer further comprising a photodetection section for detecting lights obtained by irradiating said analyzing object with the lights from said light irradiation device and for outputting signals corresponding to the detected lights, the analyzer further comprising signal acquisition means for acquiring specific signals corresponding to lights detected with said photodetection section when said light irradiation device irradiates said analyzing object with the lights transmitted through said optical filters (14b-14f) from said photodetection section, wherein said analytic means analyzes characteristics of said analyzing object on the basis of the specific signals acquired with said signal acquisition means, wherein said filter section is provided with holes for receiving said optical filters (14b-14f), said holes being provided at a prescribed angular interval, characterised in that the analyzer further comprises an optical fiber member constituted of a plurality of optical fibers, and a bundling member for bundling the optical fibers, wherein the optical fiber member is arranged to receive light transmitted through any of said optical filters from an end bundled by the bundling member, and wherein the plurality of optical fibers are arranged to supply the light received through the bundling member to a corresponding plurality of analyzing objects, and in that said analytic means creates time-series data on the basis of the specific signals acquired with said signal acquisition means and analyzes characteristics of said analyzing object on the basis of said created time-series data. a light irradiation device including a light source and a rotatable filter section having a plurality of optical filters (14b-14f) with different light transmission characteristics respectively for irradiating an analyzing object with lights transmitted through said optical filters (14b-14f) during rotation of said filter section while successively switching said optical filters (14b-14f) arranged on a path of a light from said light source by rotating said filter section at a constant speed; and analytic means for analyzing characteristics of said analyzing object on the basis of optical information obtained from said analyzing object irradiated with the lights by said light irradiation device during the rotation of said filter section, the analyzer further comprising a photodetection section for detecting lights obtained by irradiating said analyzing object with the lights from said light irradiation device and for outputting signals corresponding to the detected lights, the analyzer further comprising signal acquisition means for acquiring specific signals corresponding to lights detected with said photodetection section when said light irradiation device irradiates said analyzing object with the lights transmitted through said optical filters (14b-14f) from said photodetection section, wherein said analytic means analyzes characteristics of said analyzing object on the basis of the specific signals acquired with said signal acquisition means, wherein said filter section is provided with holes for receiving said optical filters (14b-14f), said holes being provided at a prescribed angular interval, characterised in that the analyzer further comprises an optical fiber member constituted of a plurality of optical fibers, and a bundling member for bundling the optical fibers, wherein the optical fiber member is arranged to receive light transmitted through any of said optical filters from an end bundled by the bundling member, and wherein the plurality of optical fibers are arranged to supply the light received through the bundling member to a corresponding plurality of analyzing objects, and in that said analytic means creates time-series data on the basis of the specific signals acquired with said signal acquisition means and analyzes characteristics of said analyzing object on the basis of said created time-series data.