A magnetic sensor that is easy to ensure the height of the yoke and that is also easy to guide magnetic flux in the direction in which the magnetic field sensing film detects a magnetic field is provided. The magnetic sensor includes first magnetic field detection element 21 that has first magnetic field sensing film 38 that detects a magnetic field in first direction X, and first yoke 23 that includes first portion 23a that is located on a side of first magnetic field sensing film 38 with respect to first direction X, and second portion 23b that is in contact with first portion 23a in direction Z that is orthogonal to first direction X. The average dimension of second portion 23b in first direction X is larger than the average dimension of first portion 23a in first direction X.