A dielectric filter unit includes three or more dielectric blocks including a first dielectric block and a second dielectric block and arranged in a predetermined direction, and a transmission line. The three or more dielectric blocks include at least one dielectric block between the first dielectric block and the second dielectric block. Each of the three or more dielectric blocks is electromagnetically coupled to one or two adjacent dielectric blocks included in the three or more dielectric blocks. The transmission line is electromagnetically coupled to the first dielectric block and the second dielectric block.