A yarn winder forming a package (Pw) by winding a yarn onto a bobbin, comprising: a cradle device which includes a support arm supporting the bobbin to be rotatable and is capable of moving the support arm in a predetermined direction intersecting with an axial direction of the bobbin; a vibration suppression member which is pressed onto the support arm so as to suppress vibration of the support arm; a pressing mechanism configured to press the vibration suppression member onto the support arm, characterized in that: the pressing mechanism is capable of changing the magnitude of pressing force during a winding operation of winding the yarn, and the yarn winder includes: a control unit, during the winding operation, the control unit changing the magnitude of the pressing force between first pressing force and second pressing force which is smaller than the first pressing force, and an arm driving unit which is configured to move the support arm in the predetermined direction, the control unit setting the magnitude of the pressing force at the first pressing force when the arm driving unit is not driven, and setting the magnitude of the pressing force at the second pressing force when the arm driving unit is driven. a cradle device which includes a support arm supporting the bobbin to be rotatable and is capable of moving the support arm in a predetermined direction intersecting with an axial direction of the bobbin; a vibration suppression member which is pressed onto the support arm so as to suppress vibration of the support arm; a pressing mechanism configured to press the vibration suppression member onto the support arm, characterized in that: the pressing mechanism is capable of changing the magnitude of pressing force during a winding operation of winding the yarn, and the yarn winder includes: a control unit, during the winding operation, the control unit changing the magnitude of the pressing force between first pressing force and second pressing force which is smaller than the first pressing force, and an arm driving unit which is configured to move the support arm in the predetermined direction, the control unit setting the magnitude of the pressing force at the first pressing force when the arm driving unit is not driven, and setting the magnitude of the pressing force at the second pressing force when the arm driving unit is driven. the pressing mechanism is capable of changing the magnitude of pressing force during a winding operation of winding the yarn, and the yarn winder includes: a control unit, during the winding operation, the control unit changing the magnitude of the pressing force between first pressing force and second pressing force which is smaller than the first pressing force, and an arm driving unit which is configured to move the support arm in the predetermined direction, the control unit setting the magnitude of the pressing force at the first pressing force when the arm driving unit is not driven, and setting the magnitude of the pressing force at the second pressing force when the arm driving unit is driven. a control unit, during the winding operation, the control unit changing the magnitude of the pressing force between first pressing force and second pressing force which is smaller than the first pressing force, and an arm driving unit which is configured to move the support arm in the predetermined direction, the control unit setting the magnitude of the pressing force at the first pressing force when the arm driving unit is not driven, and setting the magnitude of the pressing force at the second pressing force when the arm driving unit is driven.