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Immunoassay is known as one of the most important analytical methods and widely used in clinical diagnoses and biochemical studies. The conventional immunoassay, however, requires a long assay time. We developed a bead-bed immunoassay system integrated on a microchip which successfully reduces the assay time from 2 days to 30 minutes using simple operations for assay (Sato et al, 2000 and 2001). Here, aiming at high throughput assay, an integrated immunoassay system using a multichannel microchip was developed for simultaneous analyses of multiple samples.