Chair capable of installing a handle freely

A chair capable of installing a handle freely, comprising:

• a chair frame formed by two symmetrical sub-frames, symmetrical relative to a central dividing plane of the chair;
• each sub-frame including a supporting bar and an assembly bar bending from the supporting bar;
• one end of the assembly bar being formed with a hollow space for being inserted by a handle;
• a seat supported by the chair frame and installed between the two sub-frames;
• and
• a chair back installed to the two assembly bars of the chair frame;
• wherein the chair back has two sleeves at two sides thereof;
• each sleeve enclosing a respective one of the assembly bars of the chair frame;
• and a retainer for fixing the sleeve to the assembly bar of the frame;
• and
• wherein the handle comprises a rotatable handle portion and a shaft portion including:
• a shaft received into the hollow space and a shoulder portion abutting an end edge of the assembly bar and an end edge of one of the sleeves.