Terahertz waves corresponding to the frequency range of 0.1 to 10 THz are used as a tool not only formeasuring physical properties, but also for sensing and communication technology in recent years.Three-dimensional artificial structures having various optical functions have the possibility to realizeversatile terahertz wave control. However, conventional fabrication techniques typified by lithographyare difficult to apply in producing three-dimensional structures with a size of about a terahertzwavelength. In this research, we demonstrate that it is possible to fabricate terahertz optics by utilizingfemtosecond laser processing and 3D printing as new three-dimensional artificial structure fabricationtechnologies. By using each technology, a terahertz anti-reflecting structure and a terahertz high-passfilter were fabricated and their outstanding characteristics were confirmed using terahertz time-domainspectroscopy.