Multi stage transmission for vehicle

A multi-stage transmission for a vehicle, comprising:

• an input shaft to which power of an engine is transferred;
• an output shaft outputting the power;
• a first planetary gear set, a second planetary gear set, a third planetary gear set, and a fourth planetary gear set, each having three rotary elements;
• a first rotary shaft connected to the input shaft;
• a second rotary shaft connected to a second rotary element of the first planetary gear set and a third rotary element of the second planetary gear set;
• a third rotary shaft connected to a first rotary element of the third planetary gear set;
• a fourth rotary shaft connected to a first rotary element of the first planetary gear set, a first rotary element of the second planetary gear set, and a third rotary element of the third planetary gear set;
• a fifth rotary shaft connected to a second rotary element of the second planetary gear set;
• a sixth rotary shaft connected to a third rotary element of the first planetary gear set, a second rotary element of the third planetary gear set, and a third rotary element of the fourth planetary gear set;
• a seventh rotary shaft connected to a first rotary element of the fourth planetary gear set;
• and
• an eighth rotary shaft connected to a second rotary element of the fourth planetary gear set and the output shaft.