is an object of the present invention is the droplet interfacial tension, as well as forming a liquid droplet from the measuring object when the access solid surface is the contact angle and contact angle accurately and easily measuring module to measure, to provide a surface energy measuring apparatus and a measuring method having the same surface energy. For this purpose, in the present invention, and the hollow portion is formed inside the said hollow portion is open in a downward direction, and having an optical system in the hollow portion, the body is placed on the surface of the object to be measured solid; The scanning unit is secured to the upper part of the body from detachably inserted such that the needle is exposed to the hollow portion of the main body; And to the end of the injection needle, the falling liquid on the measurement target surface from the lower end of the injection needle droplets to recognize the measuring object surface includes an optical system for transmitting a computer, wherein the scanning unit is a vertical motion of the piston provided with a fine adjustment screw which can fine-tune, and the syringe body of the scanning unit in the sample liquid contained, the contact angle measurement module that you are allowed to free fall to less measurement target surface of the sample solution by rotating the fine adjustment screws, it provides a measurement method using the surface energy and surface energy measuring device having this.
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