Vacuum cleaner

A vacuum cleaner comprising:

• a cleaner body including a motor configured to generate a suction force and a foreign substance collection chamber;
• and
• a suction head connected to the cleaner body and including:
• a housing having a suction port,
• a drum brush,
• a one-way roller disposed in front of the drum brush,
• a wheel module supporting the suction head and disposed on at least one end of the one-way roller, and
• a one-way clutch bearing coupled to, and coaxial with, the wheel module and the at least one end of the one-way roller,
• wherein the drum brush and the one-way roller are configured so that,
• when the suction head is moving forward on a surface to be cleaned with the wheel module rotating forward, the drum brush and the one-way roller rotate so that foreign substances on the surface are suctioned by the suction force into the housing through the suction port to be guided to the foreign substance collection chamber, and
• when the suction head is moving rearward on the surface with the wheel module rotating rearward, rotation of the one-way roller is restricted to prevent the foreign substances suctioned into the housing from being discharged outside of the housing of the suction head through the suction port.