The invention relates to a capacitive touch sensor which comprises a first linear conductive electrode and a second linear conductive electrode. The first linear conductive electrode comprises at least one first main conductor and a plurality of first branch conductors, wherein the first main conductor extends continuously along a first direction, and the first branch conductors are mutually electrically connected with the first main conductor. The second linear conductive electrode comprises at least one second main conductor, wherein the second main conductor continuously extends along a second direction different from the first direction. Furthermore, the first linear conductor electrode and the second linear conductor electrode are mutually electrically insulated and are made of opaque conductive materials, and the second main conductors and the first main conductors are crossed. The invention also relates to a capacitive touch device adopting the capacitive touch sensor. The invention can reduce the resistance value of the sensor, lowers the parasitic capacitance of the sensor and an external structure, increases the linearity of touch detection and lowers the cost.