A confirmation system configured to confirm whether a pair of claws interferes with another component around a mounting position when the pair of claws clamps and mounts an electronic component on a board; the confirmation system comprising: an electronic component clamping device, including a pair of claws configured to contact a pair of side faces of an electronic component to be mounted on a board and clamp the electronic component; and a moving mechanism configured to move the pair of claws to a first position for clamping the electronic component and a second position for releasing the electronic component; electronic components to be mounted, the electronic components having various sizes; and characterized by a set of templates configured to be used in the electronic component clamping device, the set of templates comprising: multiple plate-like templates (10a, 10b, 10c) provided to correspond to the multiple distances between the pair of claws and configured to be used in confirming whether the pair of claws will interfere with another component around a mounting position when the pair of claws clamps the electronic component and mounts the electronic component on the board by superimposing a template corresponding to a selected distance with the board on which the electronic component is mounted, wherein, in the electronic component clamping device, a distance between the pair of claws when the pair of claws is in the second position can be selected from multiple distances in accordance with the size of the electronic component; and a first region which has a width corresponding to the selected distance between the pair of claws when the pair of claws is in the second position, the first region being provided on each of the multiple plate-like templates (10a, 10b, 10c) corresponding to the selected distances between the pair of claws from among the multiple distances. an electronic component clamping device, including a pair of claws configured to contact a pair of side faces of an electronic component to be mounted on a board and clamp the electronic component; and a moving mechanism configured to move the pair of claws to a first position for clamping the electronic component and a second position for releasing the electronic component; electronic components to be mounted, the electronic components having various sizes; and characterized by a set of templates configured to be used in the electronic component clamping device, the set of templates comprising: multiple plate-like templates (10a, 10b, 10c) provided to correspond to the multiple distances between the pair of claws and configured to be used in confirming whether the pair of claws will interfere with another component around a mounting position when the pair of claws clamps the electronic component and mounts the electronic component on the board by superimposing a template corresponding to a selected distance with the board on which the electronic component is mounted, wherein, in the electronic component clamping device, a distance between the pair of claws when the pair of claws is in the second position can be selected from multiple distances in accordance with the size of the electronic component; and a first region which has a width corresponding to the selected distance between the pair of claws when the pair of claws is in the second position, the first region being provided on each of the multiple plate-like templates (10a, 10b, 10c) corresponding to the selected distances between the pair of claws from among the multiple distances. multiple plate-like templates (10a, 10b, 10c) provided to correspond to the multiple distances between the pair of claws and configured to be used in confirming whether the pair of claws will interfere with another component around a mounting position when the pair of claws clamps the electronic component and mounts the electronic component on the board by superimposing a template corresponding to a selected distance with the board on which the electronic component is mounted, wherein, in the electronic component clamping device, a distance between the pair of claws when the pair of claws is in the second position can be selected from multiple distances in accordance with the size of the electronic component; and a first region which has a width corresponding to the selected distance between the pair of claws when the pair of claws is in the second position, the first region being provided on each of the multiple plate-like templates (10a, 10b, 10c) corresponding to the selected distances between the pair of claws from among the multiple distances.