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We report properties of the intracluster medium (ICM) in Abell~1246 to thevirial radius ($r_{200}$) and further outside as observed with Suzaku. The ICMemission is clearly detected to $r_{200}$, and we derive profiles of electrontemperature, density, entropy, and cluster mass based on the spectral analysis.The temperature shows variation from $\sim 7$ keV at the central region to$\sim 2.5$ keV around $r_{200}$. The total mass in $r_{500}$ is $(4.3 \pm 0.4)\times 10^{14}~M_{\odot}$, assuming hydrostatic equilibrium. At $r>r_{500}$,the hydrostatic mass starts to decline and we, therefore, employ the total masswithin $r_{200}$ based on weak-lens mass profile obtained from a sample oflower mass clusters. This yields the gas mass fraction at $r_{200}$ consistentwith the cosmic baryon fraction, i.e. $\sim 17$%. The entropy profile indicatesa flatter slope than that of the numerical simulation, particularly in$r>r_{500}$. These tendencies are similar to those of other clusters observedwith Suzaku. We detect no significant ICM emission outside of $r_{200}$, and$2\sigma$ upper limits of redshifted OVII and OVIII line intensities areconstrained to be less than 2.9 and $5.6\times 10^{-7}$ photons cm$^{-2}$s$^{-1}$ arcmin$^{-2}$, respectively. The OVII line upper limit indicates$n_{\rm H}< 4.7\times 10^{-5}$ cm$^{-3}$ ($Z/0.2~Z_{\odot}$)$^{-1/2}$($L/20~{\rm Mpc}$)$^{-1/2}$, which corresponds to an overdensity, $\delta<160$($Z/0.2~Z_{\odot}$)$^{-1/2}$ ($L/20~{\rm Mpc}$)$^{-1/2}$.

Temperature and Entropy Profiles to the Virial Radius of Abell 1246 Cluster Observed with Suzaku