A component mounting device comprising: a mounting head that is movable in a horizontal direction and mounts a held component on a substrate; and a control portion that controls operation of the mounting head, the control portion configured to perform control of making a speed of mounting, by the mounting head, a component to be closely adjacent to another component and to be mounted on the substrate such that an interval to an adjacent component is equal to or less than a predetermined threshold, on the substrate, smaller than a speed of mounting in a normal state in which the mounting head mounts a component, which is not the component to be closely adjacent to another component, on the substrate, characterized in that the mounting head includes a plurality of suction nozzles movable in a vertical direction, the plurality of suction nozzles configured to hold a plurality of components, and the control portion is configured to perform control of making a horizontal movement speed of the mounting head smaller than the movement speed in a normal state in which the mounting head holds only one or more components, which is not the component to be closely adjacent to another component, when one of the plurality of the components, which is not the component to be closely adjacent to another component, is mounted on the substrate and before one of the remaining plurality of the components, which is the component to be closely adjacent to another component, is mounted on the substrate, when at least one of the plurality of suction nozzles suctions one or more components to be closely adjacent to another component. a mounting head that is movable in a horizontal direction and mounts a held component on a substrate; and a control portion that controls operation of the mounting head, the control portion configured to perform control of making a speed of mounting, by the mounting head, a component to be closely adjacent to another component and to be mounted on the substrate such that an interval to an adjacent component is equal to or less than a predetermined threshold, on the substrate, smaller than a speed of mounting in a normal state in which the mounting head mounts a component, which is not the component to be closely adjacent to another component, on the substrate, characterized in that the mounting head includes a plurality of suction nozzles movable in a vertical direction, the plurality of suction nozzles configured to hold a plurality of components, and the control portion is configured to perform control of making a horizontal movement speed of the mounting head smaller than the movement speed in a normal state in which the mounting head holds only one or more components, which is not the component to be closely adjacent to another component, when one of the plurality of the components, which is not the component to be closely adjacent to another component, is mounted on the substrate and before one of the remaining plurality of the components, which is the component to be closely adjacent to another component, is mounted on the substrate, when at least one of the plurality of suction nozzles suctions one or more components to be closely adjacent to another component.