Recording element substrate and recording device

Abstract

A recording element substrate includes a plurality of discharging ports; a plurality of nozzles connected to the plurality of discharging ports, respectively; a passage forming portion in which a plurality of individual passages connected to the plurality of nozzles, respectively, and a common passage connected to the plurality of individual passages are formed; a plurality of supply ports disposed at positions corresponding to a plurality of nozzle groups on the common passage, respectively, along an array direction of the plurality of discharging ports; and a plurality of supply passages which extend from the plurality of supply ports to a rear surface of the recording element substrate in a direction intersecting with the rear surface. A plurality of heaters configured to heat liquid flowing through the common passage are provided for each of the plurality of supply ports along at least a part of a peripheral edge of the supply port.