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We have compiled high-resolution position-velocity diagrams observed alongthe major axes of nearby spiral galaxies in the CO-line emission, and derivedrotation curves for the inner regions of the galaxies. We have combined theinner rotation curves with the outer HI and optical rotation curves to obtainthe total rotation curves. The inner rotation curves are characterized by asteep increase within a few hundred pc radius, indicating a compact massiveconcentration near the nucleus. We fit the obtained rotation curves forindividual galaxies by a modified Miyamoto-Nagai's potential by assumingexistence of four mass components; a nuclear mass component with a scale radiusof 100-150 pc and a mass of $\sim 3-5\times 10^{9}Msun$; a central bulge of 0.5to 1 kpc radius of a mass $\sim 10^{10}Msun$; a disk with scale radius 5 to 7kpc and thickness 0.5 kpc of a mass $\sim 1-2 Mgal$; and a massive halo ofscale radius 15 to 20 kpc with a mass $\sim 2-3 Mgal$. We discuss theimplication of the nuclear compact mass component for the formation mechanismof multiple structures within the galactic bulge during its formation.Comment: Plain TEX, 16 pages, Figures on request, to appear in Ap

The Most Completely Sampled Rotation Curves for Galaxies