Patent ID: 7859370

Claim:
An electrostatic actuator in which a rocking plate is electrostatically attracted by an adsorption electrode provided on a substrate, the electrostatic actuator comprising: a plurality of supporting columns, which are fixed on the substrate and arranged in a line, for pivotally supporting the rocking plate, wherein: each of the supporting columns has a leg portion and a column capital portion, the leg portion being a portion fixed on the substrate and the column capital portion being a portion provided on the leg portion; the rocking plate has hollow domed portions; the column capital portion of each of the supporting columns is engaged with a corresponding domed portion; each of the domed portions has an inner wall having a spherical surface shape, and the column capital portion has a spherical surface shape at a portion that contacts the corresponding domed portion; and the corresponding domed portion surrounds the column capital portion so as not to be separated from the column capital portion.