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We have performed ultrahigh-resolution angle-resolved photoemissionspectroscopy to directly observe the large superconducting (SC) gap anisotropy(GA) of YNi2B2C. The result shows large SC GA with a smooth variation along anintersection of a Fermi surface (FS) around the $\Gamma$-Z line and nearlyisotropic SC gap values for two intersections of FSs around the X-P line butwith a point-like non-zero minimum only for one sheet. The point-like SC gapminimum can be connected by the nesting vector reported from band calculations.The results show unexpectedly complicated SC GA of borocarbide superconductors.

Relation between Superconducting Gap Minima and Nesting Vector in YNi2B2C