An electrostatic colloid thruster for implementing a method of ionizing a liquid is disclosed herein. When the monolithic ceramic electronic component is mounted on the circuit board, solder does not adhere to the end surfaces and portions of the outer electrode provided on portions of the two side surfaces. The second direction is the direction of movement of the control lever downward and the third direction is the direction of movement of the control lever upward. A thin-walled portion is also formed by partial etching on that region of a rear end portion of the load beam which faces the flexure.