Provided is a container for PCR enabling cell observation and a PCR treatment with a single container. In the container for PCR, a bottom surface 17a of an inside is flat, a shape of the bottom surface is a circular shape or a polygonal shape with four or more sides, a size of the bottom surface 17a is large so that a diameter L of an approximated circle circumscribing the bottom surface 17a is 0.05 mmϕ or more and 1 mmϕ or less, and an angle of an angle θ on a side surface side formed between a side surface 17b adjacent to the bottom surface 17a and the bottom surface 17a is 50° or more and 80° or less.