Laser processing device capable of starting laser processing while reducing reflected laser beam

A laser processing device for carrying out laser processing of an object to be processed by condensing a laser beam by a light condense optical system and irradiating the laser beam onto the object, the laser processing device comprising:

• a reflected beam intensity detecting part configured to detect an intensity of a reflected beam, which is a part of a laser beam irradiated from a laser oscillator via a laser optical system and then is reflected by a surface of the object so as to return to the laser oscillator or the laser optical system;
• a light condense optical system configured to condense the laser beam irradiated from the laser oscillator;
• a beam intensity increasing part configured to continuously increase an intensity of the laser beam irradiated onto the surface of the object, over a predetermined period of time;
• a next process selecting part configured to select a content of a next process, based on a temporal change in the intensity of the reflected beam detected by the reflected beam intensity detecting part, during the intensity of the laser beam irradiated onto the surface of the object is increased;
• and
• an executing part configured to execute the next process subsequent to the laser processing, based on the content of the next process selected by the next process selecting part.