A biosensor manufacturing method comprising: a sheet material forming process that forms a sheet material with a plurality of biosensor forming sections, each of the biosensor forming sections having a respective leading end and a respective rear end, each of the biosensor forming sections comprising a first base plate, a second base plate stacked on the first base plate and forming a capillary between the second base plate and a leading end portion of the first base plate, for sucking in sample liquid at a leading end of the capillary, and a hydrophilic layer formed on the second base plate at least in a region facing the capillary, wherein a region on the first base plate facing the capillary has either a test reagent or an electrode (34, 36, 38) present; and a dicing process to obtain a plurality of biosensors by dicing the sheet material with a blade (74; 75) being inserted from the first base plate side at the leading end of each of the biosensor forming sections, such that, after removal of the blade (74; 75), the leading end of the capillary opens onto leading end faces (12A, 14A) of the first base plate and the second base plate, the leading end face of the first base plate slopes toward the rear end of the first base plate on progression away from the second base plate, a face is formed on the capillary side of the leading end portion of the first base plate, said face sloping away from the second base plate on progression toward the leading end of the first base plate, such that the leading end of the capillary has a cross-section dimension, in the direction of stacking of the first base plate and the second base plate, which gets wider on progression toward the leading end of the capillary, and a projecting portion is formed on a leading end portion of the second base plate, the projecting portion extending out from the second base plate away from the capillary. a sheet material forming process that forms a sheet material with a plurality of biosensor forming sections, each of the biosensor forming sections having a respective leading end and a respective rear end, each of the biosensor forming sections comprising a first base plate, a second base plate stacked on the first base plate and forming a capillary between the second base plate and a leading end portion of the first base plate, for sucking in sample liquid at a leading end of the capillary, and a hydrophilic layer formed on the second base plate at least in a region facing the capillary, wherein a region on the first base plate facing the capillary has either a test reagent or an electrode (34, 36, 38) present; and a first base plate, a second base plate stacked on the first base plate and forming a capillary between the second base plate and a leading end portion of the first base plate, for sucking in sample liquid at a leading end of the capillary, and a hydrophilic layer formed on the second base plate at least in a region facing the capillary, wherein a region on the first base plate facing the capillary has either a test reagent or an electrode (34, 36, 38) present; and a dicing process to obtain a plurality of biosensors by dicing the sheet material with a blade (74; 75) being inserted from the first base plate side at the leading end of each of the biosensor forming sections, such that, after removal of the blade (74; 75), the leading end of the capillary opens onto leading end faces (12A, 14A) of the first base plate and the second base plate, the leading end face of the first base plate slopes toward the rear end of the first base plate on progression away from the second base plate, a face is formed on the capillary side of the leading end portion of the first base plate, said face sloping away from the second base plate on progression toward the leading end of the first base plate, such that the leading end of the capillary has a cross-section dimension, in the direction of stacking of the first base plate and the second base plate, which gets wider on progression toward the leading end of the capillary, and a projecting portion is formed on a leading end portion of the second base plate, the projecting portion extending out from the second base plate away from the capillary. the leading end of the capillary opens onto leading end faces (12A, 14A) of the first base plate and the second base plate, the leading end face of the first base plate slopes toward the rear end of the first base plate on progression away from the second base plate, a face is formed on the capillary side of the leading end portion of the first base plate, said face sloping away from the second base plate on progression toward the leading end of the first base plate, such that the leading end of the capillary has a cross-section dimension, in the direction of stacking of the first base plate and the second base plate, which gets wider on progression toward the leading end of the capillary, and a projecting portion is formed on a leading end portion of the second base plate, the projecting portion extending out from the second base plate away from the capillary.