Component for flow rate control device, and fuel injection valve

A component for a flow rate control device comprising:

• a first component;
• a second component fixed to the first component by a press-fitting portion;
• a welded portion that connects the first component and the second component;
• and
• a first gap and a second gap formed between mutually opposing surfaces of the first component and the second component,
• wherein the first gap is provided on a side of the press-fitting portion with respect to the second gap between the press-fitting portion and the welded portion, and is formed in a direction intersecting a press-fitting direction, and
• the second gap is provided on a side of the welded portion with respect to the first gap between the press fitting portion and the welded portion, and is formed in a direction intersecting the first gap,
• wherein the welded portion is a butt-welded portion having a butt-joint configuration, and the first gap is connected to the press-fitting portion, and the second gap is connected to the butt-welded portion,
• wherein a volume of the first gap is configured to be larger than a volume of the second gap,
• wherein the first gap extends in a radial direction, and the second gap extends in a vertical direction perpendicular to the radial direction.