In ALMA cycle 6, our team performed a large survey with ALMA (ALCS; ALMA lensing cluster survey; PI: K. Kohno). [Target: 33 clusters (HFF, CLASH, RELICS), Total area: 133 arcmin2, Depth: ~7µJy (source plane)] We perform multi-component SED analysis, utilizing the UV to millimeter photometries. ・Dust temperature Thanks to the deep ALMA observation, the ALCS sample exhibits a wider range in dust temperatures than conventional SMG samples (ALESS and AS2UDS). ・Dust mass ALCS established a nearly “dust mass selected” sample across z=0.5–6. This trend is the same as previous SMG samples, but ALCS probes the lower dust mass range thanks to the lensing effect. LMA Lensing Cluster Survey: Full SED Analysis of z=0.5-6 Lensed Galaxies Detected by Millimeter Observations A Ryosuke Uematsu (Kyoto Univ.), Yoshihiro Ueda (Kyoto Univ.), Kotaro Kohno (The Univ. of Tokyo), Yoshiki Toba (NAOJ), Satoshi Yamada (RIKEN), Ian Smail (Durham Univ.), Hideki Umehata (Nagoya Univ.), Seiji Fujimoto (The Univ. of Texas), Bunyo Hatsukade (The Univ. of Tokyo), Yiping Ao (Purple Mountain Observatory), Franz E. Bauer (Univ. Catolica), Gabriel Brammer (DAWN), Miroslava Dessauges-Zavadsky (Univ. of Geneva), Daniel Espada (Univ. de Granada), Jean-Baptiste Jolly (MPE), Anton M. Koekemoer (STSI), Vasily Kokorev (Univ. of Groningen), Georgios E. Magdis (DAWN), Masamune Oguri (Chiba Univ.), Fengwu Sun (Univ. of Arizona) Uematsu et al. submitted Sub/millimeter galaxies are a key population for the study of galaxy evolution because the majority of star formation at high redshifts occurred in galaxies deeply embedded in dust. To search for this population, we have performed an extensive survey with ALMA, called the ALMA Lensing Cluster Survey (ALCS). This survey covers 133 arcmin2 area and securely detects 180 sources at z~0.5–6 with a flux limit of ~0.2 mJy at 1.2 mm (Fujimoto et al. 2023). Here we report the results of multi-wavelength spectral energy distribution (SED) analysis of the whole ALCS sample, utilizing the observed-frame UV to millimeter photometry. We find that the majority of the ALCS sources lie on the star-forming main sequence, with a smaller fraction showing intense starburst activities. The ALCS sample contains high infrared-excess sources (IRX=log (Ldust/LUV)>1), including two extremely dust-obscured galaxies (IRX>5). We also confirm that the ALCS sample probes a broader range in lower dust mass than conventional SMG samples in the same redshift range. We identify six heavily obscured AGN candidates that are not detected in the archival Chandra data in addition to the three X-ray AGNs reported by (Uematsu et al. 2023). The inferred AGN luminosity density shows a possible excess at z=2–3 compared with that determined from X-ray surveys below 10 keV. 1. Sub/millimeter Galaxy High-redshift dusty star-forming galaxies (DSFGs) are a key population to elucidate the galaxy evolution, because the majority of star formation at high redshifts occurred in galaxies deeply enshrouded by dust. DSFGs are characterized by the prominent far-infrared (FIR) emission from dust heated by stars. At high redshifts, the peak of the dust emission is shifted to the millimeter band in the observed frame, where the selection function is nearly constant across z=1–8 (cf. negative K-correction). Hence, sub/millimeter observations are a powerful tool to study hight-redshift DSFGs (→ sub/millimeter galaxy [SMG]). 2. ALMA Lensing Cluster Survey Comparison of ALCS and other ALMA surveys 4. Dust properties By the SED analysis, we identify six AGN candidates that are not detected in the archival Chandra X-ray data. → X-ray upper limits indicate that they are heavily obscured (Compton-thick) AGNs. Their inferred AGN luminosity density in high-z ultra-/luminous infrared galaxies (U/LIRGs; ) shows a possible excess at z=2—3 compared with the result of X-ray surveys below 10 keV (Ueda+14). → A significant fraction of AGNs at this epoch may be heavily obscured and missed in previous X-ray