PROBLEM TO BE SOLVED: To provide a tapered TEM horn antenna having high radiation efficiency over a wide frequency band, having good reflection characteristics and radiation characteristics, and having a small size. SOLUTION: This is a tapered TEM horn antenna 1 including a pair of antenna elements 101 and 102 arranged opposite to each other and a feeding unit 20 connected to one end 11 of the pair of antenna elements 101 and 102. The element 10 is formed with a width reduction portion 14 that extends in the width direction in a linear taper shape from one end 11 toward the opening 12 and narrows in the width direction from both ends of the opening 12 to the center, and is a pair of antenna elements. 101 and 102 extend from one end 11 to the opening 12 in a curved taper shape represented by an exponential function in the height direction. [Selection diagram] Fig. 1
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