Stretchable　electronic　sensing　devices　are　defining　the　path　toward　wearable　electronics.　High-performance　flexible　strain　sensors　attached　on　clothing　or　human　skin　are　required　for　potential　applications　in　the　entertainment,　health　monitoring,　and　medical　care　sectors.　In　this　work,　conducting　copper　electrodes　were　fabricated　on　polydimethylsiloxane　as　sensitive　stretchable　microsensors　by　integrating　laser　direct　writing　and　transfer　printing　approaches.　The　copper　electrode　was　reduced　from　copper　salt　using　laser　writing　rather　than　the　general　approach　of　printing　with　pre-synthesized　copper　or　copper　oxide　nanoparticles.　An　electrical　resistivity　of　96　mu　Omega　cm　was　achieved　on　40-mu　m-thick　Cu　electrodes　on　flexible　substrates.　The　motion　sensing　functionality　successfully　demonstrated　a　high　sensitivity　and　mechanical　robustness.　This　in　situ　fabrication　method　leads　to　a　path　toward　electronic　devices　on　flexible　substrates.