An analytical chip is provided with a flow channel (5), whose section is in a closed shape and through which a fluid sample (Fs) is made to flow, for carrying out analysis regarding the fluid sample (Fs) based on interaction between a predetermined substance and a specific substance (61), which is placed facing said flow channel (5). The chip further has a projection member (9b) attached to said flow channel (5). With this arrangement, it becomes possible to analyze the fluid sample (Fs) efficiently with high precision.