A tattooing apparatus, comprising: a tattoo needle, upward and downward moving means to transmit a rotating force of a driving motor to the tattoo needle, a needle cartridge having a needle slider to support the tattoo needle, wherein the upward and downward moving means consists of a cam structure to convert a rotary movement by a rotating force of the driving motor into a linear movement, the cam structure comprising: - a bearing member (129, 229) for rolling contact to reduce vibrations and noise, - a cam member having a cam plate inclined to one side, the cam plate being rotatable by the driving motor, - a connecting rod to transmit a power to the tattoo needle, and - a cam link to travel back and forth in connection with the rotation of the cam member thus to transmit the power to the connecting rod, characterized in that the connecting rod has a joint hooked and coupled with the needle slider to be capable of being separated there from and assembled therewith, wherein the joint comprises: - an elongated rectangular joint hole in which a hanging hook projected from both sides of a lower end of the needle slider is accommodated; and - a hook hole formed to penetrate a side of the joint thus to allow the hanging hook to be fitted therein when the hanging hook rotates at an angle of 90 degrees along with the needle slider, wherein the connecting rod is formed of a hollowed tube, and a linear reciprocating movement of the connecting rod is guided by an anti-vibration tube wrapping the connecting rod, and wherein the anti-vibration tube has an anti-vibration packing fitted between an inner side of the tattooing apparatus and an outer side of the anti-vibration tube to prevent vibrations and slips thereof. a tattoo needle, upward and downward moving means to transmit a rotating force of a driving motor to the tattoo needle, a needle cartridge having a needle slider to support the tattoo needle, wherein the upward and downward moving means consists of a cam structure to convert a rotary movement by a rotating force of the driving motor into a linear movement, the cam structure comprising: - a bearing member (129, 229) for rolling contact to reduce vibrations and noise, - a cam member having a cam plate inclined to one side, the cam plate being rotatable by the driving motor, - a connecting rod to transmit a power to the tattoo needle, and - a cam link to travel back and forth in connection with the rotation of the cam member thus to transmit the power to the connecting rod, characterized in that the connecting rod has a joint hooked and coupled with the needle slider to be capable of being separated there from and assembled therewith, wherein the joint comprises: - an elongated rectangular joint hole in which a hanging hook projected from both sides of a lower end of the needle slider is accommodated; and - a hook hole formed to penetrate a side of the joint thus to allow the hanging hook to be fitted therein when the hanging hook rotates at an angle of 90 degrees along with the needle slider, - a bearing member (129, 229) for rolling contact to reduce vibrations and noise, - a cam member having a cam plate inclined to one side, the cam plate being rotatable by the driving motor, - a connecting rod to transmit a power to the tattoo needle, and - a cam link to travel back and forth in connection with the rotation of the cam member thus to transmit the power to the connecting rod, characterized in that the connecting rod has a joint hooked and coupled with the needle slider to be capable of being separated there from and assembled therewith, - an elongated rectangular joint hole in which a hanging hook projected from both sides of a lower end of the needle slider is accommodated; and - a hook hole formed to penetrate a side of the joint thus to allow the hanging hook to be fitted therein when the hanging hook rotates at an angle of 90 degrees along with the needle slider, wherein the connecting rod is formed of a hollowed tube, and a linear reciprocating movement of the connecting rod is guided by an anti-vibration tube wrapping the connecting rod, and wherein the anti-vibration tube has an anti-vibration packing fitted between an inner side of the tattooing apparatus and an outer side of the anti-vibration tube to prevent vibrations and slips thereof.