Feeding method of the microchip and microchip

It is a simple flow channel configuration, fed to a predetermined position of the liquid in the microchannel without depending on the pressure difference was fed to a predetermined position, and a mixture of two or more liquid mass and to provide a microchip capable of. For this purpose, the flow path of the micro channel r, the intermediate reservoir 139 for temporarily storing were fed microchannels liquid, a microchip having the intermediate reservoir 139 side road comprising a 139s, and smaller than the total amount of liquid capacity Vs of the intermediate reservoir 139 is sent to the intermediate reservoir 139, the side path 139s, the upstream side relative to the intermediate reservoir 139 micro-channel r1 and downstream It communicates the fine channel r2, the cross-sectional area and microchip being smaller than the cross-sectional area of ​​the micro channel r.