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We present the results of CO observations toward 14 host galaxies oflong-duration gamma-ray bursts (GRBs) at z = 0.1-2.5 by using the Atacama LargeMillimeter/submillimeter Array. We successfully detected CO(3-2) or CO(4-3)emission in eight hosts (z = 0.3-2), which more than doubles the sample size ofGRB hosts with CO detection. The derived molecular gas mass is $M_{\rm gas} =(0.2-6) \times 10^{10}$ $M_{\odot}$ assuming metallicity-dependent CO-to-H$_2$conversion factors. By using the largest sample of GRB hosts with molecular gasestimates (25 in total, of which 14 are CO-detected) including results from theliterature, we compared molecular gas properties with those of otherstar-forming galaxies (SFGs). The GRB hosts tend to have a higher molecular gasmass fraction ($\mu_{\rm gas}$) and a shorter gas depletion timescale ($t_{\rmdepl}$) as compared with other SFGs at similar redshifts especially at $z\lesssim 1$. This could be a common property of GRB hosts or an effectintroduced by the selection of targets which are typically above themain-sequence line. To eliminate the effect of selection bias, we analyzed$\mu_{\rm gas}$ and $t_{\rm depl}$ as a function of the distance from themain-sequence line ($\delta$MS). We find that the GRB hosts follow the samescaling relations as other SFGs, where $\mu_{\rm gas}$ increases and $t_{\rmdepl}$ decreases with increasing $\delta {\rm MS}$. No molecular gas deficit isobserved when compared to other SFGs of similar SFR and stellar mass. Thesefindings suggest that the same star-formation mechanism is expected to behappening in GRB hosts as in other SFGs.

ALMA CO Observations of the Host Galaxies of Long-duration Gamma-ray Bursts. I: Molecular Gas Scaling Relations