A bunsetsu is a base phrasal unit and consists of one or more content words followed by zero or more function words. In addition, most of algorithms of Japanese dependency parsing, e.g., (Sekine et al., 2000;<cite> Sassano, 2004)</cite> , assume the three constraints below. (1) Each bunsetsu has only one head except the rightmost one. (2) Dependency links between bunsetsus go from left to right. (3) Dependency links do not cross one another.