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We analyze the dependence of the stellar disc flatness on the galaxymorphological type using 2D decomposition of galaxies from the reliablesubsample of the Edge-on Galaxies in SDSS (EGIS) catalogue. Combining thesedata with the retrieved models of the edge-on galaxies from the Two Micron AllSky Survey (2MASS) and the Spitzer Survey of Stellar Structure in Galaxies(S$^4$G) catalogue, we make the following conclusions:  (1) The disc relative thickness $z_0/h$ in the near- and mid-infraredpassbands correlates weakly with morphological type and does not correlate withthe bulge-to-total luminosity ratio $B/T$ in all studied bands.  (2) Applying an 1D photometric profile analysis overestimates the discthickness in galaxies with large bulges making an illusion of the relationshipbetween the disc flattening and the ratio $B/T$.  (3) In our sample the early-type disc galaxies (S0/a) have both flat and"puffed" discs. The early spirals and intermediate-type galaxies have a largescatter of the disc flatness, which can be caused by the presence of a bar:barred galaxies have thicker stellar discs, on average. On the other hand, thelate-type spirals are mostly thin galaxies, whereas irregular galaxies havepuffed stellar discs.

Does the stellar disc flattening depend on the galaxy type?