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We present newly obtained three-dimensional gaseous maps of the Milky WayGalaxy; HI, H$_2$ and total-gas (HI plus H$_2$) maps, which were derived fromthe HI and $^{12}$CO($J=1$--0) survey data and rotation curves based on thekinematic distance. The HI and H$_2$ face-on maps show that the HI disk isextended to the radius of 15--20 kpc and its outskirt is asymmetric to theGalactic center, while most of the H$_2$ gas is distributed inside the solarcircle. The total gas mass within radius 30 kpc amounts to $8.0\times 10^9$M$_\odot$, 89\% and 11\% of which are HI and H$_2$, {respectively}. Thevertical slices show that the outer HI disk is strongly warped and the inner HIand H$_2$ disks are corrugated. The total gas map is advantageous to tracespiral structure from the inner to outer disk. Spiral structures such as theNorma-Cygnus, the Perseus, the Sagittarius-Carina, the Scutum-Crux, and theOrion arms are more clearly traced in the total gas map than ever. All thespiral arms are well explained with logarithmic spiral arms with pitch angle of$11\degree$ -- $15\degree$. The molecular fraction to the total gas is highnear the Galactic center and decreases with the Galactocentric distance. Themolecular fraction also locally enhanced at the spiral arms compared with theinter-arm regions.

Three-Dimensional Distribution of the ISM in the Milky Way Galaxy: III. The Total Neutral Gas Disk