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We present a host morphological study of 1266 far-infrared galaxies (FIRGs)and submillimeter galaxies (SMGs) in the Cosmic Evolution Survey field usingthe F160W and F814W images obtained by the Hubble Space Telescope. The FIRGsand SMGs are selected from the Herschel Multi-tiered Extragalactic Survey andthe SCUBA-2 Cosmology Legacy Survey, respectively. Their precise locations arebased on the interferometry data from the Atacama LargeMillimeter/submillimeter Array and the Very Large Array. These objects aremostly at $0.1\lesssim z\lesssim 3$. The SMGs can be regarded as the populationat the high-redshift tail of the FIRGs. Most of our FIRGs/SMGs have a totalinfrared luminosity ($L_{\rm IR}$) in the regimes of luminous and ultraluminousinfrared galaxies (LIRGs, $L_{\rm IR} = 10^{11-12}L_\odot$; ULIRGs, $L_{\rmIR}>10^{12}L_\odot$). The hosts of the SMG ULIRGs, FIRG ULIRGs, and FIRG LIRGsare of sufficient numbers to allow for detailed analysis, and they are onlymodestly different in their stellar masses. Their morphological types arepredominantly disk galaxies (type D) and irregular/interacting systems (typeIrr/Int). There is a morphological transition at $z\approx 1.25$ for the FIRGULIRG hosts, above which the Irr/Int galaxies dominate and below which the Dand Irr/Int galaxies have nearly the same contributions. The SMG ULIRG hostsseem to experience a similar transition. This suggests a shift in the relativeimportance of galaxy mergers/interactions versus secular gas accretions in"normal" disk galaxies as the possible triggering mechanisms of ULIRGs. TheFIRG LIRG hosts are predominantly D galaxies over $z=$ 0.25--1.25, where theyare of sufficient statistics.

Morphological Evolution of the Hosts of Far-Infrared/Submillimeter Galaxies