Blood pressure information measuring device, which has: a
cuff (20) which assumes an annular shape in a mounted state in which it is mounted on a mounting location; a first fluid bag (23) provided in the
cuff (20) and wrapped around a proximal side of the
attachment site in the attached state; a second fluid bag (24) provided in the
cuff (20) and wrapped around a portion including a distal side of the
attachment site in the attached state; an inflation / deflation mechanism (30B) capable of inflating / deflating the first fluid bag (23) and the second fluid bag (24); a main body (10) which is separate from the cuff (20) and in which the inflation / deflation mechanism (30B) is provided; a hose connection connecting the first fluid bag (23) and the second fluid bag (24) to the inflation / deflation mechanism (30B); an opening / closing valve provided in the hose connection and allowing communication of the first fluid bag (23) with at least one of the second fluid bag (24) and the inflation / deflation mechanism (30B) in an open state, and maintains an
internal pressure of the first fluid bag (23) by preventing communication of the first fluid bag (23) with the second fluid bag (24) and the inflation / deflation mechanism (30B) in a
closed state; a first
pressure detection unit (33A) which is arranged on a portion of the hose connection connecting the first fluid bag (23) and the opening / closing valve, is provided and which detects the
internal pressure of the first fluid bag (23); and a
pulse wave detecting unit which detects a
pulse wave based on the pressure detected by the first pressure detecting unit (33A), wherein the opening / closing valve is provided in the cuff (20), the portion of the hose connection connecting the first fluid bag (23) and the opening / closing valve is provided in the cuff (20), and the first
pressure detection unit (33A) is provided in the cuff (20), wherein the cuff (20) further includes an outer base part (22) in which the first fluid bag (23) and the second fluid bag (24) are accommodated, the opening / closing valve is housed in the outer base part (22), the portion of the hose connection connecting the first fluid bag (23) and the opening / closing valve is housed in the outer base part (22), and the first
pressure detection unit (33A) is housed in the outer base part (22).