Abstract
The micro fluidic devices that observe the state of blood are developed. In this research, the micro fluid device that observes the state of blood is developed. A number of heat-hardening resin-films were piled up on a soda glass. A laser fabricated apart of the channel at each film on every lalmination, and then 3-D honeycomb structure and groove structure microchannel were fabricated. The channel sizes have widths of 10-300µm and depths of 30-90µm. Blood was injected into them. The aspect ratio and the distribution density of the hole were changed, and the flow of erythrocyte was observed with a microscope.