Photo-z bias b_z (z_cl) as a function of cluster redshift z_cl. The result derived from the first-year HSC data is shown by the red crosses, which are re-scaled to the three-year HSC data shown by the black points based on the difference in the photo-z between the data sets (see Sect. 3.8). We also show a reference at the level of 1% by the gray shaded region. The resulting b_z(z_cl) is applied to the calibration of weak-lensing mass bias for eFEDS clusters (see Sect. 4.2).