[Problem] To obtain a ceramic circuit substrate having high bonding strength, excellent heat cycle resistance, enhanced reliability of operation as an electronic device, and excellent heat dissipation properties.[Solution] A ceramic circuit substrate in which metal plates and both main surfaces of a ceramic substrate are bonded via silver-copper brazing material layers, the ceramic Cit quit substrate characterized in that the silver-copper brazing material layers are formed from a silver-copper brazing material including 0.3-7.5 parts by mass of carbon fibers and 1.0-9.0 parts by mass of at least one active metal selected from titanium, zirconium, hafnium, niobium, tantalum, vanadium, and tin with respect to 75-98 parts by mass of silver powder and 2-25 parts by mass of copper powder totaling 100 part by mass, with the carbon fibers having an average length of 15-400 μm, an average diameter of 5-25 μm and an average aspect ratio of 3-28.