Clip for tube element

A clip for tube element, comprising:

• a flat tube having a pair of even surfaces facing each other;
• a corrugated fin formed in a waveform;
• a plurality of tube elements in which a bent part on one side of the wave of the corrugated fin is joined with the even surface orthogonally to an axis line Z of the flat tube wherein;
• the clip for coupling these tube elements each other includes:
• in an instance of defining a ridgeline direction of the bent part which is orthogonal to the axis line Z as Y, while defining a direction orthogonal to the Y and Z as X;
• a first fitting part in which a groove bottom is formed in a dovetail groove shape in the Z direction on one side surface in the X direction, and a convex second fitting part that is formed on the other side surface and has a horizontal section fittable to the first fitting part;
• a back surface holding part in which one side in the Y direction is opened, the part holding one end part orthogonal to a ridgeline direction of the bent part of the corrugated fin at an end edge of an inner wall surface thereof to have a hook-shaped horizontal section;
• a front surface holding part with a U-shaped horizontal section that holds the other end part of the corrugated fin, on an unopened side;
• and
• a tongue piece that is formed between the back surface holding part and the front surface holding part and is inserted between neighboring waves of the corrugated fin.