Micromixer

A micromixer comprising:

• a first channel plate that:
• has a front surface and a rear surface, wherein
• in the front surface, a first channel and a plurality of first branch channels are each formed by a non-through groove, and the first channel being divided into the first branch channels, and
• in the rear surface, a first confluence channel is formed by a non-through groove, and
• includes a first communication channel that communicates the first branch channels with the first confluence channel;
• a first lid plate that covers the front surface of the first channel plate;
• a second channel plate that:
• has a front surface and a rear surface, wherein
• in the front surface, a second confluence channel is formed by a non-through groove, and
• in the rear surface, a second channel and a plurality of second branch channels are each formed by a non-through groove, the second channel being divided into the second branch channels, and
• includes a second communication channel that communicates the second branch channels with the second confluence channel, the second confluence channel facing and communicating with the first confluence channel;
• and
• a second lid plate that covers the rear surface of the second channel plate.